JEE Main & Advanced Chemistry Surface & Nuclear Chemistry / भूतल और नाभिकीय रसायन Question Bank

done Colloids Emulsion, Gel and Their properties with application Total Questions - 209

• question_answer1)
  Gold number is                                                                                                                                                 [MP PET/PMT 1988]
  A)
                  The number of mg of lyophilic colloid which should be added to 10 ml of ferric hydroxide sol so as to prevent its coagulation by the addition of 1 ml of 10% sodium chloride solution done clear
  B)
                  The number of mg of lyophilic colloid which should be added to 10 ml of standard gold sol so as to prevent its coagulation by the addition of 1 ml of 10% \[NaCl\] done clear
  C)
                  The mg of gold salt to be added to a lyophilic colloid to coagulate it done clear
  D)
                  The mg of an electrolyte required to coagulate a colloid done clear
  View Solution play_arrow

• question_answer2)
  Which of the following statement is wrong for lyophobic sol
  A)
                  Dispersed phase is generally in organic material done clear
  B)
                  Can be easily coagulated by small addition of electrolyte done clear
  C)
                  Dispersed phase particles are poorly hydrated and colloid is stabilised due to charge on the colloidal particles done clear
  D)
                  Reversible in nature that is after coagulation can be easily set into colloidal form done clear
  View Solution play_arrow

• question_answer3)
  Which of the following statements is not true for a lyophobic sol
  A)
                  It can be easily solvated done clear
  B)
                  It carries charge done clear
  C)
                  The coagulation of this sol is irreversible in nature done clear
  D)
                  It is less stable in a solvent done clear
  View Solution play_arrow

• question_answer4)
  \[A{{s}_{2}}{{S}_{3}}\] sol has a negative charge. Capacity to precipitate it is highest in    [CPMT 1982, 89, 93; DPMT 1983;MP PET 1999]
  A)
                  \[AlC{{l}_{3}}\] done clear
  B)
                  \[N{{a}_{3}}P{{O}_{4}}\] done clear
  C)
                  \[CaC{{l}_{2}}\] done clear
  D)
                  \[{{K}_{2}}S{{O}_{4}}\] done clear
  View Solution play_arrow

• question_answer5)
  Starch dispersed in hot water is an example of
  A)
                  Emulsion              done clear
  B)
                  Hydrophobic sol done clear
  C)
                  Lyophilic sol        done clear
  D)
                  Associated colloid done clear
  View Solution play_arrow

• question_answer6)
  Which of the following is most effective in coagulating a ferric hydroxide sol        [MP PET 1993, 97; MP PMT 2000]
  A)
                  \[KCl\] done clear
  B)
                  \[KN{{O}_{3}}\] done clear
  C)
                  \[{{K}_{2}}S{{O}_{4}}\]  done clear
  D)
                  \[{{K}_{3}}[Fe{{(CN)}_{6}}]\] done clear
  View Solution play_arrow

• question_answer7)
  Sky looks blue due to     [MNR 1986; MP PET 1992]
  A)
                  Dispersion effect             done clear
  B)
                  Reflection done clear
  C)
                  Transmission      done clear
  D)
                  Scattering done clear
  View Solution play_arrow

• question_answer8)
  Which one is an example of gel
  A)
                  Soap      done clear
  B)
                  Cheese done clear
  C)
                  Milk       done clear
  D)
                  Fog done clear
  View Solution play_arrow

• question_answer9)
  The random or zig-zag motion of the colloidal particles in the dispersion medium is referred to as [CPMT 1985; JIPMER 1997; MP PET 2000]
  A)
                  Electro-osmosis done clear
  B)
                  Electrophoresis done clear
  C)
                  Brownian movement done clear
  D)
                  Tyndall effect done clear
  View Solution play_arrow

• question_answer10)
  Which of the following electrolytes is least effective in causing flocculation of ferric hydroxide sol [MNR 1991; UPSEAT 1999]
  A)
                  \[{{K}_{4}}[Fe{{(CN)}_{6}}]\]      done clear
  B)
                  \[{{K}_{2}}Cr{{O}_{4}}\] done clear
  C)
                  \[KBr\] done clear
  D)
                  \[{{K}_{2}}S{{O}_{4}}\] done clear
  View Solution play_arrow

• question_answer11)
  If the dispersed phase is a liquid and the dispersion medium is a solid, the colloid is known as [NCERT 1981; CBSE PMT 1989; KCET 1998]
  A)
                  A sol      done clear
  B)
                  An emulsion done clear
  C)
                  A gel      done clear
  D)
                  A foam done clear
  View Solution play_arrow

• question_answer12)
  Zig-zag motion (eratic motion) of particles in colloid was observed by                                      [CPMT 1985]
  A)
                  Tyndall  done clear
  B)
                  Zsigmondy done clear
  C)
                  Robert brown    done clear
  D)
                  Thomas Graham done clear
  View Solution play_arrow

• question_answer13)
  On addition of one ml solution of \[10%NaCl\] to 10 ml gold sol in the presence of 0.25 gm of starch, the coagulation is just prevented. Starch has the following gold number [MP PET/PMT 1988]
  A)
                  0.025     done clear
  B)
                  0.25 done clear
  C)
                  0.5          done clear
  D)
                  250 done clear
  View Solution play_arrow

• question_answer14)
  Tyndall effect would be observed in a [CPMT 1973, 79, 90, 91, 94; MP PET 1999; MP PMT 1973, 89; DPMT 1982, 83; AFMC 1999]
  A)
                  Solution               done clear
  B)
                  Colloidal solution done clear
  C)
                  Precipitate          done clear
  D)
                  Solvent done clear
  View Solution play_arrow

• question_answer15)
  Ferric hydroxide sol is positively charged colloid. The coagulating power of \[NO_{3}^{-},\,SO_{4}^{2-}\] and \[PO_{4}^{3-}\] ions would be in the order
  A)
                  \[NO_{3}^{-}>SO_{4}^{2-}>PO_{4}^{3-}\]            done clear
  B)
                  \[SO_{4}^{2-}>NO_{3}^{-}>PO_{4}^{3-}\] done clear
  C)
                  \[PO_{4}^{3-}>SO_{4}^{2-}>NO_{3}^{-}\]            done clear
  D)
                  \[NO_{3}^{-}=SO_{4}^{2-}=PO_{4}^{3-}\] done clear
  View Solution play_arrow

• question_answer16)
  A colloidal solution can be purified by [MP PET 1993; CPMT 1990; MP PMT 2001]
  A)
                  Filtration              done clear
  B)
                  Peptization done clear
  C)
                  Coagulation        done clear
  D)
                  Dialysis done clear
  View Solution play_arrow

• question_answer17)
  Gold number is associated with
  A)
                  Only lyophobic colloids done clear
  B)
                  Only lyophilic colloids done clear
  C)
                  Both lyophobic and lyophilic colloids done clear
  D)
                  None of these done clear
  View Solution play_arrow

• question_answer18)
  Which of the following forms a colloidal solution in water  [MP PET 1990; CPMT 1988]
  A)
                  \[NaCl\]               done clear
  B)
                  Glucose done clear
  C)
                  Starch   done clear
  D)
                  Barium nitrate done clear
  View Solution play_arrow

• question_answer19)
  A negatively charged suspension of clay in water will need for precipitation the minimum amount of      [CPMT 1973]
  A)
                  Aluminium chloride         done clear
  B)
                  Potassium sulphate done clear
  C)
                  Sodium hydroxide           done clear
  D)
                  Hydrochloric acid done clear
  View Solution play_arrow

• question_answer20)
  Difference between colloids and crystalloids is of [CPMT 1979]
  A)
                  Particle composition       done clear
  B)
                  Particle size done clear
  C)
                  Concentration   done clear
  D)
                  Ionic character done clear
  View Solution play_arrow

• question_answer21)
  The purification of the colloidal particles from crystalloid dimensions through semipermeable membrane is known as [BHU 1979; MP PMT 1999; CBSE 1996; Pb. CET 2002]
  A)
                  Coagulation        done clear
  B)
                  Dialysis done clear
  C)
                  Ultrafiltration     done clear
  D)
                  Peptisation done clear
  View Solution play_arrow

• question_answer22)
  The stability of lyophilic colloids is due to [CPMT 1971, 81, 83, 93, 96; AFMC 1998; MP PMT 1990, 95; MP PET 1992]
  A)
                  Charge on their particles done clear
  B)
                  A layer of dispersion medium on their particles done clear
  C)
                  The smaller size of their particles done clear
  D)
                  The large size of their particles done clear
  View Solution play_arrow

• question_answer23)
  Milk is a colloid in which [MP PMT 1985, 2002; MP PET 2001; JIPMER (Med.) 2002]
  A)
                  A liquid is dispersed in liquid done clear
  B)
                  A solid is dispersed in liquid done clear
  C)
                  A gas is dispersed in liquid done clear
  D)
                  Some suger is dispersed in water done clear
  View Solution play_arrow

• question_answer24)
  Smoke is an example of                [CPMT 1984; BIT 1992]
  A)
                  Gas dispersed in liquid   done clear
  B)
                  Gas dispersed in solid done clear
  C)
                  Solid dispersed in gas     done clear
  D)
                  Solid dispersed in solid done clear
  View Solution play_arrow

• question_answer25)
  Gold number is minimum in case of         [MP PMT 1985]
  A)
                  Gelatin done clear
  B)
                  Egg albumin done clear
  C)
                  Gum arabic         done clear
  D)
                  Starch done clear
  View Solution play_arrow

• question_answer26)
  Movement of colloidal particles under the influence of electrostatic field is [AMU 1985, 88,02; MP PMT 1987, 89; CPMT 1988,94; Roorkee 1995; MP PET 1992; AIIMS 2001; UPSEAT 2004]
  A)
                  Electrophoresis done clear
  B)
                  Electrolysis done clear
  C)
                  Dialysis done clear
  D)
                  Ionisation done clear
  View Solution play_arrow

• question_answer27)
  Which of the following substances gives a positively charged sol                                [CPMT 1983, 84; MP PMT 1990; MP PET 1992]
  A)
                  Gold      done clear
  B)
                  A metal sulphite done clear
  C)
                  Ferric hydroxide               done clear
  D)
                  An acidic dye done clear
  View Solution play_arrow

• question_answer28)
  Light scattering in colloidal particles is
  A)
                  Visible to naked eye done clear
  B)
                  Not visible by any means done clear
  C)
                  Visible under ordinary microscope done clear
  D)
                  Visible under ultra-microscope done clear
  View Solution play_arrow

• question_answer29)
  Flocculation value is expressed in terms of           [MP PMT 1986]
  A)
                  millimole per litre             done clear
  B)
                  mole per litre done clear
  C)
                  gram per litre     done clear
  D)
                  mole per milliliter done clear
  View Solution play_arrow

• question_answer30)
  Which of the following is an emulsifier
  A)
                  Soap      done clear
  B)
                  Water done clear
  C)
                  Oil           done clear
  D)
                  \[NaCl\] done clear
  View Solution play_arrow

• question_answer31)
  Suspensions are                                               [CPMT 1984]
  A)
                  Visible to naked eye done clear
  B)
                  Invisible through microscope done clear
  C)
                  Not visible by any means done clear
  D)
                  Invisible under electron microscope done clear
  View Solution play_arrow

• question_answer32)
  Gelatin is mostly used in making ice cream in order to [NCERT 1979; MP PET/PMT 1988]
  A)
                  Prevent making of colloid done clear
  B)
                  To stabilise the colloid and prevent crystallization done clear
  C)
                  To stabilise mixture done clear
  D)
                  To enrich the aroma done clear
  View Solution play_arrow

• question_answer33)
  In emulsions, the dispersion medium and dispersed phase are                 
  A)
                  Both solids done clear
  B)
                  Both gases done clear
  C)
                  Both liquids done clear
  D)
                  One is solid and other is liquid done clear
  View Solution play_arrow

• question_answer34)
  Lyophilic sols are more stable than lyophobic sols because [NCERT 1982, 83]
  A)
                  The colloidal particles have positive charge done clear
  B)
                  The colloidal particles have no charge done clear
  C)
                  The colloidal particles are solvated done clear
  D)
                  There are strong electrostatic repulsions between the negatively charged colloidal particles done clear
  View Solution play_arrow

• question_answer35)
  Which is the correct statement in case of milk [CPMT 1977; MNR 1988; UPSEAT 2000, 01, 02]
  A)
                  Milk is an emulsion of protein in water done clear
  B)
                  Milk is an emulsion of fat in water done clear
  C)
                  Milk is stabilised by protein done clear
  D)
                  Milk is stabilised by fat done clear
  View Solution play_arrow

• question_answer36)
  Which of the following electrolytes have maximum coagulating power
  A)
                  \[CC{{l}_{4}}\]   done clear
  B)
                  \[ZnC{{l}_{2}}\] done clear
  C)
                  \[KCl\] done clear
  D)
                  \[NaCl\] done clear
  View Solution play_arrow

• question_answer37)
  Which one of the following is not a colloidal solution [MADT Bihar 1983]
  A)
                  Smoke  done clear
  B)
                  Ink done clear
  C)
                  Air          done clear
  D)
                  Blood done clear
  View Solution play_arrow

• question_answer38)
  Detergent action of soap is due to
  A)
                  Emulsification properties done clear
  B)
                  Hydrolysis done clear
  C)
                  Ionization            done clear
  D)
                  High molecular weight done clear
  View Solution play_arrow

• question_answer39)
  When dispersion medium is water, the colloidal system is called                                                [MP PMT 1986]
  A)
                  Sol          done clear
  B)
                  Aerosol done clear
  C)
                  Organosol           done clear
  D)
                  Aquasol done clear
  View Solution play_arrow

• question_answer40)
  When a freshly precipitated substance is converted into a colloidal solution with the help of a third substance, the process is known as
  A)
                  Coagulation        done clear
  B)
                  Peptization done clear
  C)
                  Electrodispersion             done clear
  D)
                  Dialysis done clear
  View Solution play_arrow

• question_answer41)
  Which of the following will have highest coagulating power for \[A{{s}_{2}}{{S}_{3}}\] colloid [CPMT 1988; DPMT 1984; Pb. PMT 2001; Pb. CET 2004]
  A)
                  \[PO_{4}^{-3}\] done clear
  B)
                  \[SO_{4}^{-2}\] done clear
  C)
                  \[N{{a}^{+}}\]    done clear
  D)
                  \[A{{l}^{3+}}\] done clear
  View Solution play_arrow

• question_answer42)
  Which one of the following is a hydrophobic sol [MP PET 1991]
  A)
                  Starch solution done clear
  B)
                  Gum solution done clear
  C)
                  Protein solution done clear
  D)
                  Arsenic sulphide solution done clear
  View Solution play_arrow

• question_answer43)
  Purification of colloids is done by the process of [CPMT 1988]
  A)
                  Electrophoresis done clear
  B)
                  Electrodispersion done clear
  C)
                  Peptization         done clear
  D)
                  Ultra-filteration done clear
  View Solution play_arrow

• question_answer44)
  Which of the following terms is not related with colloids [CPMT 1985, 87, 88]
  A)
                  Dialysis done clear
  B)
                  Ultrafiltration done clear
  C)
                  Wavelength       done clear
  D)
                  Brownian movement done clear
  View Solution play_arrow

• question_answer45)
  When dispersed phase is liquid and dispersion medium is gas, then the colloidal system is called               [CPMT 1984]
  A)
                  Smoke  done clear
  B)
                  Clouds done clear
  C)
                  Emulsion              done clear
  D)
                  Jellies done clear
  View Solution play_arrow

• question_answer46)
  Tyndall phenomenon is exhibited by      [CPMT 1985]
  A)
                  \[NaCl\] solution              done clear
  B)
                  Starch solution done clear
  C)
                  Urea solution     done clear
  D)
                  \[FeC{{l}_{3}}\] solution done clear
  View Solution play_arrow

• question_answer47)
  The colloidal solution of gelatin is known               [CPMT 1984]
  A)
                  Solvent loving sol             done clear
  B)
                  Reversible sol done clear
  C)
                  Hydrophilic colloids         done clear
  D)
                  All of these done clear
  View Solution play_arrow

• question_answer48)
  The zig-zag motion of colloidal particles is due to
  A)
                  Small size of colloidal particles done clear
  B)
                  Large size of colloidal particles done clear
  C)
                  The conversion of potential energy into kinetic energy done clear
  D)
                  Bombardment on colloidal particles by molecules of dispersion medium done clear
  View Solution play_arrow

• question_answer49)
  Which is a natural colloidal           [DPMT 1985]
  A)
                  Sodium chloride               done clear
  B)
                  Urea done clear
  C)
                  Canesugar           done clear
  D)
                  Blood done clear
  View Solution play_arrow

• question_answer50)
  Sodium stearate forms in water
  A)
                  True solution     done clear
  B)
                  A suspension done clear
  C)
                  An emulsion       done clear
  D)
                  A colloidal solution done clear
  View Solution play_arrow

• question_answer51)
  Blood contains
  A)
                  Positively charged particles done clear
  B)
                  Negatively charged particles done clear
  C)
                  Neutral particles done clear
  D)
                  Negatively as well as positively charged particles done clear
  View Solution play_arrow

• question_answer52)
  Brownian motion is due to [MNR 1987; CPMT 1987; UPSEAT 2001, 02]
  A)
                  Temperature fluctuation within the liquid phase done clear
  B)
                  Attraction and repulsion between charge on the colloidal done clear
  C)
                  Impact of molecules of the dispersion medium on the colloidal particles done clear
  D)
                  Convective currents done clear
  View Solution play_arrow

• question_answer53)
  Milk can be preserved by adding a few drops of [MADT Bihar 1981]
  A)
                  Formic acid solution done clear
  B)
                  Formaldehyde solution done clear
  C)
                  Acetic acid solution done clear
  D)
                  Acetaldehyde solution done clear
  View Solution play_arrow

• question_answer54)
  When a colloidal solution is observed under a microscope we can see                                     [CPMT 1985]
  A)
                  Light scattered by colloidal particles done clear
  B)
                  Size of colloidal particles done clear
  C)
                  Shape of colloidal particles done clear
  D)
                  Relative size of the colloidal particles done clear
  View Solution play_arrow

• question_answer55)
  Property of the colloidal solution is due to
  A)
                  Nature of dispersed phase done clear
  B)
                  Nature of dispersion medium done clear
  C)
                  Physical state of dispersed phase done clear
  D)
                  Temperature of the system done clear
  View Solution play_arrow

• question_answer56)
  Which of the following has minimum value of flocculating power                                              [MP PET 1989, 90]
  A)
                                                                                                           \[P{{b}^{+2}}\]                 done clear
  B)
                                                                                                           \[P{{b}^{+4}}\]   done clear
  C)
                                                                                                            \[S{{r}^{+2}}\]                 done clear
  D)
                                                                                            \[N{{a}^{+}}\] done clear
  View Solution play_arrow

• question_answer57)
  According to Graham, colloids are those substances which are
  A)
                  Insoluble in water done clear
  B)
                  In solution do not pass through filter paper done clear
  C)
                  Of definite size of particles done clear
  D)
                  Separated from crystalloids by parchment paper done clear
  View Solution play_arrow

• question_answer58)
  The reason for exhibiting Tyndall effect by the colloidal particle is             [CPMT 1980, 86; MP PMT 1989]
  A)
                  Reflection of light            done clear
  B)
                  Refraction of light done clear
  C)
                  Polarisation of light         done clear
  D)
                  Scattering of light done clear
  View Solution play_arrow

• question_answer59)
  Which of the following shows the maximum hydrophobic behaviour                                       [NCERT 1982]
  A)
                  Glycerine             done clear
  B)
                  Stearic acid done clear
  C)
                  Glucose                done clear
  D)
                  Adenine done clear
  View Solution play_arrow

• question_answer60)
  A liquid aerosol is a colloidal system of   [MP PMT 1987]
  A)
                  A liquid dispersed in a solid done clear
  B)
                  A liquid dispersed in a gas done clear
  C)
                  A gas dispersed in a liquid done clear
  D)
                  A solid dispersed in a gas done clear
  View Solution play_arrow

• question_answer61)
  The blue colour of water in the sea is due to       [NCERT 1983]
  A)
                  Refraction of blue light by the impurities in sea water done clear
  B)
                  Reflection of blue sky by sea water done clear
  C)
                  Scattering of blue light by water moleules done clear
  D)
                  Absorption of other colours except the blue colour by water molecules done clear
  View Solution play_arrow

• question_answer62)
  Butter  is a colloid. It is formed when [MNR 1982; MP PET 1991; MP PMT 1994; CPMT 2002]
  A)
                  Fat is dispersed in solid casein done clear
  B)
                  Fat globules are dispersed in water done clear
  C)
                  Water is dispersed in fat done clear
  D)
                  Casein is suspended in                                                                                           \[{{H}_{2}}O\] done clear
  View Solution play_arrow

• question_answer63)
  Colloidal solution cannot be obtained from two such substances which are
  A)
                  Insoluble in each other  done clear
  B)
                  In same physical state done clear
  C)
                  In different physical state            done clear
  D)
                  None of these done clear
  View Solution play_arrow

• question_answer64)
  Which of the following reactions leads to the formation of a substance in the colloidal state [MP PMT 1984; MP PET/PMT 1988]
  A)
                                                                                   \[Cu+HgC{{l}_{2}}\to CuC{{l}_{2}}+Hg\]   done clear
  B)
                                                                   \[2HN{{O}_{3}}+3{{H}_{2}}S\to 3S+4{{H}_{2}}O+2NO\]   done clear
  C)
                                                                                          \[2Mg+C{{O}_{2}}\to 2MgO+C\]   done clear
  D)
                                                                               \[Cu+CuC{{l}_{2}}\to C{{u}_{2}}C{{l}_{2}}\]   (in presence of excess of \[HCl\]) done clear
  View Solution play_arrow

• question_answer65)
  Lyophobic colloids are    [MP PMT 1986; DPMT 1996]
  A)
                  Reversible colloids           done clear
  B)
                  Irreversible colloids done clear
  C)
                  Protective colloids           done clear
  D)
                  Gum proteins done clear
  View Solution play_arrow

• question_answer66)
  Substances whose solutions can readily diffuse through parchment membranes are                                       [CPMT 1984]
  A)
                  Colloids done clear
  B)
                  Crystalloids done clear
  C)
                  Electrolytes        done clear
  D)
                  Non-electrolytes done clear
  View Solution play_arrow

• question_answer67)
  Size of colloidal particles varies from [CPMT 1982, 90, 93, 97; CBSE PMT 1996; MP PMT 1995; AIIMS 2002; KCET 2004]
  A)
                                                                                                            \[{{10}^{-7}}\]  to                                                                                       \[{{10}^{-9}}\,m\]                 done clear
  B)
                                                                                                            \[{{10}^{-9}}\]  to                                                                                      \[{{10}^{-17}}\,m\]   done clear
  C)
                                                                                                            \[{{10}^{-5}}\]  to                                                                                       \[{{10}^{-7}}\,m\]                 done clear
  D)
                                                                                                            \[{{10}^{-4}}\]  to                                                                                      \[{{10}^{-10}}\,m\] done clear
  View Solution play_arrow

• question_answer68)
  Which of the following pairs of ions would be expected to form precipitate when their dilute solution are mixed [CPMT 1976]
  A)
                                                                                              \[N{{a}^{+}},\,SO_{3}^{2-}\]                 done clear
  B)
                                                                                            \[NH_{4}^{+},\,CO_{3}^{2-}\]   done clear
  C)
                                                                                                \[N{{a}^{+}},\,{{S}^{-2}}\]                 done clear
  D)
                                                                             \[F{{e}^{+3}},\,PO_{4}^{-3}\] done clear
  View Solution play_arrow

• question_answer69)
  Jelly is a form of
  A)
                  Suspension         done clear
  B)
                  Colloidal solution done clear
  C)
                  Supersaturated solution               done clear
  D)
                  True solution done clear
  View Solution play_arrow

• question_answer70)
  Bleeding is stopped by the application of ferric chloride. This is because
  A)
                  Ferric chloride seal the blood cells. done clear
  B)
                  Blood starts flowing in the other direction done clear
  C)
                  Blood is coagulated and blood vessel is sealed done clear
  D)
                  None of these done clear
  View Solution play_arrow

• question_answer71)
  The colloidal particles can pass through
  A)
                  Filter paper as well as animal membrane done clear
  B)
                  Animal membrane but not through filter paper done clear
  C)
                  Filter paper but not through animal membrane done clear
  D)
                  Semipermeable membrane done clear
  View Solution play_arrow

• question_answer72)
  The emulsifying agent in milk is
  A)
                  Lactic acid            done clear
  B)
                  Casein done clear
  C)
                  Lactose done clear
  D)
                  Fat done clear
  View Solution play_arrow

• question_answer73)
  Butter is                                               [MP PMT 1990]
  A)
                  A gel      done clear
  B)
                  An emulsion done clear
  C)
                  A sol      done clear
  D)
                  Not a colloid done clear
  View Solution play_arrow

• question_answer74)
  An emulsion is a colloidal dispersion of   [BCECE 2005]
  A)
                  A liquid in a gas done clear
  B)
                  A liquid in a liquid done clear
  C)
                  A solid in a liquid               done clear
  D)
                  A gas in a solid   done clear
  View Solution play_arrow

• question_answer75)
  The colloidal solution of mercury in water can be easily obtained by
  A)
                  Mechanical precipitation              done clear
  B)
                  Bredig's arc method done clear
  C)
                  Repeated washing          done clear
  D)
                  Ultrasonic dispersion done clear
  View Solution play_arrow

• question_answer76)
  The rate of dialysis depends upon
  A)
                  Nature of colloidal substance done clear
  B)
                  Temperature of the solution done clear
  C)
                  Both of these done clear
  D)
                  None of these done clear
  View Solution play_arrow

• question_answer77)
  An emulsifier                                     [MP PET 1995]
  A)
                  Accelerates the dispersion done clear
  B)
                  Homogenises the emulsion done clear
  C)
                  Stabilizes the emulsion done clear
  D)
                  Aids the flocculation of emulsion done clear
  View Solution play_arrow

• question_answer78)
  The difference between a lyophilic and lyophobic colloid is in their
  A)
                  Particle size done clear
  B)
                  Behaviour towards dispersion medium done clear
  C)
                  Filtrability done clear
  D)
                  None of these done clear
  View Solution play_arrow

• question_answer79)
  When a substance comes in colloidal state the surface area of the particles
  A)
                  Increases done clear
  B)
                  Decreases done clear
  C)
                  Remains unchanged done clear
  D)
                  First increases then decreases done clear
  View Solution play_arrow

• question_answer80)
  Which of the impurity can be separated from a solution by electrodialysis
  A)
                  Alcohol done clear
  B)
                  Alum done clear
  C)
                  Sugar     done clear
  D)
                  Parchment paper done clear
  View Solution play_arrow

• question_answer81)
  The reason for the stability of a lyophobic sol is
  A)
                  Brownian movement done clear
  B)
                  Tyndall effect done clear
  C)
                  Electric charge done clear
  D)
                  Brownian movement and electric charge done clear
  View Solution play_arrow

• question_answer82)
  For coagulating \[A{{s}_{2}}{{S}_{3}}\] colloidal sol, which of the following will have the lowest coagulation value [MP PMT 1996; DCE 2000]
  A)
                  \[NaCl\]               done clear
  B)
                  \[KCl\] done clear
  C)
                  \[BaC{{l}_{2}}\]                 done clear
  D)
                  \[AlC{{l}_{3}}\] done clear
  View Solution play_arrow

• question_answer83)
  Some substances behave as electrolytes in dilute solutions and as colloids in their concentrated solutions. Their colloidal forms are said to form  [AMU 2002]
  A)
                  Emulsions            done clear
  B)
                  Gels done clear
  C)
                  Micelles               done clear
  D)
                  Sols done clear
  View Solution play_arrow

• question_answer84)
  Which one can act as semipermeable membrane [Pb. PMT 2002]
  A)
                  Phenol layer       done clear
  B)
                  \[C{{a}_{3}}{{(P{{O}_{4}})}_{2}}\] done clear
  C)
                  \[C{{u}_{2}}Fe{{(CN)}_{6}}\]       done clear
  D)
                  All of these done clear
  View Solution play_arrow

• question_answer85)
  In which particles can pass through semipermeable  membrane                                                [Pb. PMT 2002]
  A)
                  Molecules of solvent      done clear
  B)
                  Complex ions done clear
  C)
                  Simple ions         done clear
  D)
                  Molecules of solute done clear
  View Solution play_arrow

• question_answer86)
  Silver iodide is used for producing artificial rain because \[AgI\] [NCERT 1984]
  A)
                  Is easy to spray at high altitudes done clear
  B)
                  Is easy to synthesize done clear
  C)
                  Has crystal structure similar to ice done clear
  D)
                  Is insoluble in water done clear
  View Solution play_arrow

• question_answer87)
  Surface water contains [AFMC 2003]
  A)
                  Salt done clear
  B)
                  Salt and organic compound done clear
  C)
                  Organic compounds done clear
  D)
                  Suspended impurities done clear
  View Solution play_arrow

• question_answer88)
  Gelatin is mixed in ice-cream
  A)
                  As a coagulant   done clear
  B)
                  For taste done clear
  C)
                  For colour            done clear
  D)
                  As a protective colloid done clear
  View Solution play_arrow

• question_answer89)
  Which of the following is an example of `water in oil' type emulsion
  A)
                  Butter   done clear
  B)
                  Milk done clear
  C)
                  Cream   done clear
  D)
                  Face cream done clear
  View Solution play_arrow

• question_answer90)
  In which of the following Tyndall effect is not observed [MP PET/PMT 1998]
  A)
                  Suspensions       done clear
  B)
                  Emulsions done clear
  C)
                  Sugar solution   done clear
  D)
                  Gold sol done clear
  View Solution play_arrow

• question_answer91)
  Which of the following is a lyophilic colloid  [MP PET/PMT 1998]
  A)
                  Milk       done clear
  B)
                  Gum done clear
  C)
                  Fog         done clear
  D)
                  Blood done clear
  View Solution play_arrow

• question_answer92)
  Which characteristic is true in respect of colloidal particle [CPMT 1993; UPSEAT 2000]
  A)
                  They always have two phases done clear
  B)
                  They are only in liquid state done clear
  C)
                  They can't be electrolysed done clear
  D)
                  They are only hydrophilic done clear
  View Solution play_arrow

• question_answer93)
  Gold number is a measure of the [MP PMT 1989; MP PET 1989,90; DCE 1999; BHU 1999; CBSE PMT 1989]
  A)
                  Protective action by a lyophilic colloid on a lyophobic colloid done clear
  B)
                  Protective action by a lyophobic colloid on a lyophilic colloid done clear
  C)
                  Number of \[mg\] of gold in a standard red gold sol done clear
  D)
                  Stability of gold sol done clear
  View Solution play_arrow

• question_answer94)
  Sulphur sol contains                                        [UPSEAT 2002]
  A)
                  Discrete sulphur atoms done clear
  B)
                  Discrete sulphur molecules done clear
  C)
                  Large agreegates of sulphur molecules done clear
  D)
                  Water dispersed in solid sulphur done clear
  View Solution play_arrow

• question_answer95)
  Pick out the statement which is not relevant in the discussion of colloids                                               [KCET 2003]
  A)
                  Sodium aluminium silicate is used in the softening of hard water done clear
  B)
                  Potash alum is used in shaving rounds and as antiseptic in medicine done clear
  C)
                  Artificial rain is caused by throwing electrified sand on the clouds from an aeroplane  done clear
  D)
                  Deltas are formed at a place where the river pours its water into the sea done clear
  View Solution play_arrow

• question_answer96)
  Surface tension of lyophilic sols is                             [MP PMT 1992]
  A)
                  Lower than \[{{H}_{2}}O\]           done clear
  B)
                  More than \[{{H}_{2}}O\] done clear
  C)
                  Equal to \[{{H}_{2}}O\] done clear
  D)
                  None of these done clear
  View Solution play_arrow

• question_answer97)
  When excess of electrolyte is added to a colloid it [CBSE PMT 1989]
  A)
                  Coagulates          done clear
  B)
                  Precipitates done clear
  C)
                  Gets diluted       done clear
  D)
                  Does not change done clear
  View Solution play_arrow

• question_answer98)
  The shape of colloidal particles is
  A)
                  Sphere like         done clear
  B)
                  Rod like done clear
  C)
                  Disc like                done clear
  D)
                  Thread like done clear
  E)
                  All of these done clear
  View Solution play_arrow

• question_answer99)
  Colloidal solution of arsenious sulphide is coagulated by [MP PMT 1992]
  A)
                  Addition of electrolyte done clear
  B)
                  Addition of non-electrolyte done clear
  C)
                  Addition of solid \[A{{s}_{2}}{{S}_{3}}\] done clear
  D)
                  None of these done clear
  View Solution play_arrow

• question_answer100)
  Different colloidal particles of gold having different colours, obtained from different methods due to                                                 [MP PET 1989; UPSEAT 2001, 02; EAMCET 2003]
  A)
                  Variable valency of gold done clear
  B)
                  Different concentration of gold particles done clear
  C)
                  Different types of impurities done clear
  D)
                  Different radius of colloidal particles done clear
  View Solution play_arrow

• question_answer101)
  Which one of the following is lyophilic colloid [MP PET 1989]
  A)
                  Gelatin done clear
  B)
                  Sulphur done clear
  C)
                  Gold      done clear
  D)
                  Carbon done clear
  View Solution play_arrow

• question_answer102)
  Which one of the following properties of colloids is related with scattering of light            [MP PMT 1989]
  A)
                  Diffusion              done clear
  B)
                  Peptization done clear
  C)
                  Tyndall effect    done clear
  D)
                  Brownian movement done clear
  View Solution play_arrow

• question_answer103)
  Which one of the following is a hydrophilic colloidal sol
  A)
                  Barium hydroxide sol     done clear
  B)
                  Arsenic sulphide sol done clear
  C)
                  Starch solution done clear
  D)
                  Silver chloride sol done clear
  View Solution play_arrow

• question_answer104)
  The coagulation power of an electrolyte for arsenious sulphide decreases in the order   [JIPMER 1997]
  A)
                  \[N{{a}^{+}},\,A{{l}^{+3}},\,B{{a}^{+2}}\]              done clear
  B)
                  \[PO_{4}^{-3},\,SO_{4}^{-2},\,C{{l}^{-}}\] done clear
  C)
                  \[A{{l}^{+3}},\,B{{a}^{+2}},\,N{{a}^{+}}\]              done clear
  D)
                  \[C{{l}^{-}},\,SO_{4}^{-2},\,PO_{4}^{-3}\] done clear
  View Solution play_arrow

• question_answer105)
  Size of colloidal particle is             [BCECE 2005]
  A)
                  1 nm      done clear
  B)
                  1 ? 100 nm done clear
  C)
                  > 100 nm              done clear
  D)
                  > 1000 nm done clear
  View Solution play_arrow

• question_answer106)
  The concentration of electrolyte  required to coagulate a given amount of \[A{{s}_{2}}{{S}_{3}}\] sol is minimum in the case of [KCET 2003]
  A)
                  Magnesium nitrate done clear
  B)
                  Potassium nitrate done clear
  C)
                  Potassium sulphate done clear
  D)
                  Aluminium nitrate done clear
  View Solution play_arrow

• question_answer107)
  When a strong beam of light is passed through a colloidal solution, the light will [BHU 1996; JIPMER 1997]
  A)
                  Give a rainbow done clear
  B)
                  Be scattered done clear
  C)
                  Be reflected done clear
  D)
                  Absorbed completely done clear
  View Solution play_arrow

• question_answer108)
  A cleared solution which is again converted into colloidal solution, the process is called   [DPMT 1996]
  A)
                  Peptisation         done clear
  B)
                  Electrolytic addition done clear
  C)
                  Electrophoresis done clear
  D)
                  None of these done clear
  View Solution play_arrow

• question_answer109)
  In dialysis, colloidal particles are separated from [DPMT 1996]
  A)
                  Solvent done clear
  B)
                  Dispersed phase done clear
  C)
                  Ions of electrolytes done clear
  D)
                  Particles of dispersion medium done clear
  View Solution play_arrow

• question_answer110)
  Colour of colloidal solution is due to        [CPMT 1996]
  A)
                  Different size of colloidal particles done clear
  B)
                  Due to formation of complex done clear
  C)
                  Due to formation of hydrated crystal done clear
  D)
                  None of these done clear
  View Solution play_arrow

• question_answer111)
  Which of the following is property of colloid        [CPMT 1996]
  A)
                  Scattering of light             done clear
  B)
                  They show attraction done clear
  C)
                  Dialysis done clear
  D)
                  Emulsion done clear
  View Solution play_arrow

• question_answer112)
  The size of particles in suspension, true solution and colloidal solution varies in the order [BHU 1997]
  A)
                  Suspension > Colloidal > True solution done clear
  B)
                  Suspension > (Colloidal + True solution) done clear
  C)
                  True solution > Suspension > Colloidal done clear
  D)
                  None of these done clear
  View Solution play_arrow

• question_answer113)
  Which of the following represents surfactant molecule [JIPMER 1997]
  A)
                  \[{{C}_{17}}{{H}_{36}}\]                done clear
  B)
                  \[{{C}_{17}}{{H}_{25}}CO{{O}^{-}}N{{a}^{+}}\] done clear
  C)
                  \[{{H}_{2}}O\]   done clear
  D)
                  None of these done clear
  View Solution play_arrow

• question_answer114)
  In lyophilic sols the attraction of sol particles towards the medium is due to
  A)
                  Covalent bond  done clear
  B)
                  Vander Waal's force done clear
  C)
                  Hydrogen bond done clear
  D)
                  None of these done clear
  View Solution play_arrow

• question_answer115)
  If some gelatin is mixed in colloidal solution of gold, then it does
  A)
                  Coagulation of gold done clear
  B)
                  Peptization of gold done clear
  C)
                  Protection of gold sol done clear
  D)
                  Protection of gelatin done clear
  View Solution play_arrow

• question_answer116)
  Emulsifiers are generally
  A)
                  Soap      done clear
  B)
                  Synthetic detergents done clear
  C)
                  Lyophilic sols      done clear
  D)
                  All of these done clear
  View Solution play_arrow

• question_answer117)
  In shaving cream, the dispersion medium is
  A)
                  Liquid    done clear
  B)
                  Gas done clear
  C)
                  Solid      done clear
  D)
                  None of these done clear
  View Solution play_arrow

• question_answer118)
  The minimum quantity of sodium chloride which is necessary to precipitate 10 litres of sol in two hours is 0.585 gm. The flocculation value of sodium chloride is
  A)
                  0.585     done clear
  B)
                  0.0585 done clear
  C)
                  0.1          done clear
  D)
                  One done clear
  View Solution play_arrow

• question_answer119)
  Which one is an example of miceller system
  A)
                  Soap + water     done clear
  B)
                  Protein + water done clear
  C)
                  Rubber + benzene          done clear
  D)
                  \[A{{s}_{2}}{{O}_{3}}+Fe{{(OH)}_{3}}\] done clear
  View Solution play_arrow

• question_answer120)
  ?Delta? at the rivers are formed due to
  A)
                  Peptization         done clear
  B)
                  Coagulation done clear
  C)
                  Hydrolysis           done clear
  D)
                  Precipitation done clear
  View Solution play_arrow

• question_answer121)
  Tyndall effect is more pronounced in
  A)
                  Hydrophilic sols done clear
  B)
                  Hydrophobic sols done clear
  C)
                  Starch solution done clear
  D)
                  Both B and C done clear
  View Solution play_arrow

• question_answer122)
  Emulsifier is mixed to
  A)
                  Increase the stability of emulsion done clear
  B)
                  Decrease the stability of emulsion done clear
  C)
                  Change oil into water like emulsion done clear
  D)
                  None of these done clear
  View Solution play_arrow

• question_answer123)
  White of an egg is partly coagulated by heating which can be again obtained back by some pepsin and little \[HCl\].  This process is called
  A)
                  Peptization         done clear
  B)
                  Coagulation done clear
  C)
                  Precipitation      done clear
  D)
                  None of these done clear
  View Solution play_arrow

• question_answer124)
  When sugar is added to a colloidal solution it brings about
  A)
                  Ionization            done clear
  B)
                  Coagulation done clear
  C)
                  Peptization         done clear
  D)
                  None of these done clear
  View Solution play_arrow

• question_answer125)
  Colloidal solutions of metals like gold, silver and platinum are generally prepared by using            [DPMT 1984]
  A)
                  Peptization         done clear
  B)
                  Bredig's arc method done clear
  C)
                  Exchange of solvent       done clear
  D)
                  Oxidation method done clear
  View Solution play_arrow

• question_answer126)
  Liquid?liquid sols are known as [CPMT 1999]
  A)
                  Aerosols              done clear
  B)
                  Emulsions done clear
  C)
                  Foam     done clear
  D)
                  Gel done clear
  View Solution play_arrow

• question_answer127)
  Tyndall effect depends upon the
  A)
                  Charge on the colloidal particles done clear
  B)
                  Osmotic pressure of colloidal solution done clear
  C)
                  Difference between the refractive indices of dispersed phase and dispersion medium done clear
  D)
                  Size of colloidal particles done clear
  View Solution play_arrow

• question_answer128)
  Which one of the sols acts as protective colloid [MP PMT 1990; MP PET 1990, 92; RPET 2003]
  A)
                  \[A{{s}_{2}}{{S}_{3}}\]   done clear
  B)
                  Gelatin done clear
  C)
                  \[Au\]   done clear
  D)
                  \[Fe{{(OH)}_{3}}\] done clear
  View Solution play_arrow

• question_answer129)
  The example of heteropolar sol is
  A)
                  Starch sol in water           done clear
  B)
                  Rubber sol in water done clear
  C)
                  Protein sol in water         done clear
  D)
                  Sulphur sol done clear
  View Solution play_arrow

• question_answer130)
  In Bredig's arc method some alkali is added because
  A)
                  It increases electrical conductance done clear
  B)
                  To obtain molecular colloid done clear
  C)
                  To obtain colloidal particles of same size done clear
  D)
                  To stabilise the sol done clear
  View Solution play_arrow

• question_answer131)
  Which one of the following is not a colloid            [BIT 1992]
  A)
                  Milk       done clear
  B)
                  Blood done clear
  C)
                  Solution of urea                done clear
  D)
                  Ice cream done clear
  View Solution play_arrow

• question_answer132)
  Milk is an example of     [BIT 1992; CPMT 1994; MP PET 1996; BHU 1996]
  A)
                  Pure solution     done clear
  B)
                  Emulsion done clear
  C)
                  Gel         done clear
  D)
                  Suspension done clear
  View Solution play_arrow

• question_answer133)
  Dialysis is the process of separation of
  A)
                  Suspended particles from colloids done clear
  B)
                  Suspended particles from crystalloids done clear
  C)
                  Colloidal particles from crystalloids done clear
  D)
                  Colloidal particles from gel done clear
  View Solution play_arrow

• question_answer134)
  Minimum concentration of electrolyte which can precipitate any sol is                                    [BIT 1992]
  A)
                  Peptization value             done clear
  B)
                  Gold number done clear
  C)
                  Avogadro's number        done clear
  D)
                  Flocculation value done clear
  View Solution play_arrow

• question_answer135)
  Whipped cream is an example of                              [MNR 1978]
  A)
  Dispersion medium         Dispersed phase                 Gas                        Liquid done clear
  B)
                  Liquid                    Gas done clear
  C)
                  Liquid                    Liquid done clear
  D)
                  Liquid                    Solid done clear
  View Solution play_arrow

• question_answer136)
  Milk is                   [MP PMT 1995;CPMT 1988; MP PET 1991; MNR 1982]
  A)
                  Dispersed fats in oil         done clear
  B)
                  Dispersed fats in water done clear
  C)
                  Dispersed water in fats                 done clear
  D)
                  Dispersed water in oil done clear
  View Solution play_arrow

• question_answer137)
  A coagulating agent frequently added to water to remove the suspended and colloidal impurities is
  A)
                  Mohr salt             done clear
  B)
                  Alum done clear
  C)
                  Bleaching powder            done clear
  D)
                  Copper sulphate done clear
  View Solution play_arrow

• question_answer138)
  \[Fe{{(OH)}_{3}}\] when treated with \[FeC{{l}_{3}}\] solution  a reddish-brown solution is formed. The process involved is [AFMC 1982]
  A)
                  Dispersion           done clear
  B)
                  Exchange of solvent done clear
  C)
                  Peptization         done clear
  D)
                  None of these done clear
  View Solution play_arrow

• question_answer139)
  Alum purifies muddy water by
  A)
                  Dialysis done clear
  B)
                  Absorption done clear
  C)
                  Coagulation        done clear
  D)
                  Forming a true solution done clear
  View Solution play_arrow

• question_answer140)
  Which of the following statements is not true for a lyophilic sol
  A)
                  It can be easily solvated done clear
  B)
                  It carries no charge done clear
  C)
                  Coagulation of this sol is reversible in nature done clear
  D)
                  It is not very stable in a solvent done clear
  View Solution play_arrow

• question_answer141)
  High concentration of gelatin in water on heating gives colloidal solution, which is called
  A)
                  Foam     done clear
  B)
                  Gel done clear
  C)
                  Gas        done clear
  D)
                  Air done clear
  View Solution play_arrow

• question_answer142)
  Size of colloidal particle is [CPMT 1988; MP PMT 1991; RPET 2000]
  A)
                  1 to 10 Å               done clear
  B)
                  20 to 50 Å done clear
  C)
                  10 to 1000 Å        done clear
  D)
                  1 to 280 Å done clear
  View Solution play_arrow

• question_answer143)
  Which one is Freundlich's equation
  A)
                  \[\frac{x}{m}=\log \,K+\frac{1}{n}\log \,P\]         done clear
  B)
                  \[\frac{x}{m}=\exp \,(-KP)\] done clear
  C)
                  \[\frac{x}{m}=K{{P}^{2}}\]           done clear
  D)
                  \[\log \frac{x}{m}=\log K+\frac{1}{n}\log \,C\] done clear
  View Solution play_arrow

• question_answer144)
  Ferric chloride is applied to stop bleeding cut because
  A)
                  \[F{{e}^{3+}}\] ion coagulates blood, which is a negatively charged sol done clear
  B)
                  \[F{{e}^{3+}}\] ion coagulates blood, which is a positively charged sol done clear
  C)
                  \[C{{l}^{-}}\] coagulates blood, which is a positively charged sol done clear
  D)
                  \[C{{l}^{-}}\] ion coagulates blood, which is a negatively charged sol done clear
  View Solution play_arrow

• question_answer145)
  At the critical micelle concentration, the surfactant molecules [CBSE PMT 1998]
  A)
                  Decompose done clear
  B)
                  Dissociate done clear
  C)
                  Associate done clear
  D)
                  Become completely soluble done clear
  View Solution play_arrow

• question_answer146)
  The decomposition of \[{{H}_{2}}{{O}_{2}}\] can be slowed down by the addition of small amount of phosphoric acid which act as [JIPMER 2000]
  A)
                  Promoter            done clear
  B)
                  Inhibitor done clear
  C)
                  Detainer              done clear
  D)
                  Stopper done clear
  View Solution play_arrow

• question_answer147)
  Which of the following molecules is most suitable to disperse benzene in water                [AIIMS 2005]
  A)
                  done clear
  B)
                  done clear
  C)
                  done clear
  D)
                  done clear
  View Solution play_arrow

• question_answer148)
  Luminosity observed as a result of scattering of light by particles is observed in  [RPET 2000]
  A)
                  Suspension         done clear
  B)
                  Colloidal solution done clear
  C)
                  True solution     done clear
  D)
                  None of these done clear
  View Solution play_arrow

• question_answer149)
  Which of the following makes the lyophilic solution unstable [MP PMT 1994]
  A)
                  Dialysis done clear
  B)
                  Addition of electrolyte done clear
  C)
                  Addition of alcohol done clear
  D)
                  Addition of alcohol and electrolyte both done clear
  View Solution play_arrow

• question_answer150)
  A detergent is a                                                [CPMT 1993]
  A)
                  Cleaning agent  done clear
  B)
                  Drug done clear
  C)
                  Catalyst                done clear
  D)
                  Vitamin done clear
  View Solution play_arrow

• question_answer151)
  Gold number is related with       [MP PET 2000]
  A)
                  Colloids                done clear
  B)
                  Radioactivity done clear
  C)
                  Gas equation     done clear
  D)
                  Kinetic energy done clear
  View Solution play_arrow

• question_answer152)
  Small liquid droplets dispersed in another liquid is called [Pb. PMT 2000]
  A)
                  Gel         done clear
  B)
                  Emulsion done clear
  C)
                  Suspension         done clear
  D)
                  True solution done clear
  View Solution play_arrow

• question_answer153)
  Which of the following is used for the destruction of colloids [CBSE PMT 2000]
  A)
                  Dialysis done clear
  B)
                  Condensation done clear
  C)
                  By ultrafiltration               done clear
  D)
                  By adding electrolyte done clear
  View Solution play_arrow

• question_answer154)
  An example of an associated colloid is [CBSE PMT 2000; MP PET 2000]
  A)
                  Milk       done clear
  B)
                  Soap solution done clear
  C)
                  Rubber latex      done clear
  D)
                  Vegetable oil done clear
  View Solution play_arrow

• question_answer155)
  The movement of colloidal particles towards the oppositely charged electrodes on passing electricity is known as  [AFMC 2000]
  A)
                  Cataphoresis      done clear
  B)
                  Tyndall effect done clear
  C)
                  Brownian movement     done clear
  D)
                  None of these done clear
  View Solution play_arrow

• question_answer156)
  Tyndall effect is shown by            [Pb. PMT 1999]
  A)
                  Sol          done clear
  B)
                  Solution done clear
  C)
                  Plasma  done clear
  D)
                  Precipitation done clear
  View Solution play_arrow

• question_answer157)
  Colloidal solutions of gold prepared by different methods have different colours owing to           [JIPMER 1999]
  A)
                  The difference in the size of the colloidal particles done clear
  B)
                  The fact that gold exhibits a variable valency of + 1 and + 3 done clear
  C)
                  Different concentrations of gold done clear
  D)
                  Presence of different types of foreign particles depending upon the method of preparation of the colloid done clear
  View Solution play_arrow

• question_answer158)
  Which of the following colloids are formed when hydrogen sulphide gas is passed through a cold solution of arsenious oxide     [CPMT 2000]
  A)
                  \[A{{s}_{2}}{{S}_{3}}\]   done clear
  B)
                  \[A{{s}_{2}}{{O}_{3}}\] done clear
  C)
                  \[A{{s}_{2}}S\]  done clear
  D)
                  \[A{{s}_{2}}{{H}_{2}}\] done clear
  View Solution play_arrow

• question_answer159)
  The simplest way to check whether a system is colloidal, is [KCET (Med.) 2002]
  A)
                  Tyndall effect    done clear
  B)
                  Electro dialysis done clear
  C)
                  Brownian movement     done clear
  D)
                  Finding out particle size done clear
  View Solution play_arrow

• question_answer160)
  Fog is an example of colloidal system [MNR 1985; NCERT 1985; CPMT 1988; MP PMT 1991; MP PET 1996; UPSEAT 1999, 2000]
  A)
                  Liquid dispersed in gas   done clear
  B)
                  Gas dispersed in gas done clear
  C)
                  Solid dispersed in gas     done clear
  D)
                  Gas dispersed in liquid done clear
  View Solution play_arrow

• question_answer161)
  In the measurement of gold number, the useful electrolyte is
  A)
                  \[AuC{{l}_{3}}\] done clear
  B)
                  \[NaCl\] done clear
  C)
                  \[AlC{{l}_{3}}\] done clear
  D)
                  \[FeC{{l}_{3}}\] done clear
  View Solution play_arrow

• question_answer162)
  Blood may be purified by             [MP PMT 2000]
  A)
                  Dialysis done clear
  B)
                  Electro-osmosis done clear
  C)
                  Coagulation        done clear
  D)
                  Filtration done clear
  View Solution play_arrow

• question_answer163)
  The stability of lyophilic colloidal sol is due to
  A)
                  Both charge and solvation done clear
  B)
                  Only solvation done clear
  C)
                  Only charge done clear
  D)
                  None of these done clear
  View Solution play_arrow

• question_answer164)
  The impurities present in rain water possess ..... charge
  A)
                  Positive                done clear
  B)
                  Negative done clear
  C)
                  Zero       done clear
  D)
                  Positive and negative done clear
  View Solution play_arrow

• question_answer165)
  Sodium lauryl sulphate is              [RPET 2003]
  A)
                  Cationic sol         done clear
  B)
                  Anionic sol done clear
  C)
                  Neutral sol          done clear
  D)
                  None of these done clear
  View Solution play_arrow

• question_answer166)
  Which of the following statement is false
  A)
                  Every solid substance can be brought into colloidal state done clear
  B)
                  Colloidal particles carry electrical charges done clear
  C)
                  Every solid substance can be made to behave like a lyophilic colloid done clear
  D)
                  Addition of electrolytes causes flocculation of colloidal particles done clear
  View Solution play_arrow

• question_answer167)
  Which is a colloid                                              [CPMT 1984]
  A)
                  Sugar solution   done clear
  B)
                  Urea solution done clear
  C)
                  Silicic acid done clear
  D)
                  \[NaCl\] solution done clear
  View Solution play_arrow

• question_answer168)
  Alum helps in purifying water by               [AIEEE 2002]
  A)
                  Forming Si complex with clay particles done clear
  B)
                  Sulphate part which combines with the dirt and removes it done clear
  C)
                  Aluminium which coagulates the mud particles done clear
  D)
                  Making mud water soluble done clear
  View Solution play_arrow

• question_answer169)
  Maximum coagulation power is in                            [MP PET 1989, 90]
  A)
                  \[N{{a}^{+}}\]    done clear
  B)
                  \[B{{a}^{++}}\] done clear
  C)
                  \[A{{l}^{+++}}\]                done clear
  D)
                  \[S{{n}^{++++}}\] done clear
  View Solution play_arrow

• question_answer170)
  Which of the following is not an emulsion             [MP PET 2003]
  A)
                  Butter   done clear
  B)
                  Ice cream done clear
  C)
                  Milk       done clear
  D)
                  Cloud done clear
  View Solution play_arrow

• question_answer171)
  Colloidal solution of gold cannot be prepared by
  A)
                  Bredig's arc method        done clear
  B)
                  Mechanical dispersion done clear
  C)
                  Reduction of gold chloride           done clear
  D)
                  Exchange of solvents done clear
  View Solution play_arrow

• question_answer172)
  Which of the following ions can cause coagulation of proteins                                     [KCET 2000]
  A)
                  \[A{{g}^{+}}\]    done clear
  B)
                  \[N{{a}^{+}}\] done clear
  C)
                  \[M{{g}^{++}}\]                done clear
  D)
                  \[C{{a}^{++}}\] done clear
  View Solution play_arrow

• question_answer173)
  Light scattering takes place in [MP PMT 1991; BHU 2000; AFMC 2001; Kerala PET 2002]
  A)
                  Solutions of electrolyte done clear
  B)
                  Colloidal solutions done clear
  C)
                  Electrodialysis    done clear
  D)
                  Electroplating done clear
  View Solution play_arrow

• question_answer174)
  Which of the following can stabilize gold sol from coagulation by \[NaCl\]  solution
  A)
                  \[Fe{{(OH)}_{3}}\]           done clear
  B)
                  Gelatin done clear
  C)
                  \[A{{s}_{2}}{{S}_{3}}\]   done clear
  D)
                  None of these done clear
  View Solution play_arrow

• question_answer175)
  At isoelectric point
  A)
                  Colloidal sol becomes highly stable done clear
  B)
                  Precipitation of a colloidal sol takes place done clear
  C)
                  Colloidal particles becomes uncharged done clear
  D)
                  Peptization can be carried out done clear
  View Solution play_arrow

• question_answer176)
  Which one is an example of multimolecular colloid system
  A)
                  Soap dispersed in water               done clear
  B)
                  Protein dispersed in water done clear
  C)
                  Gold dispersed in water                done clear
  D)
                  Gum dispersed in water done clear
  View Solution play_arrow

• question_answer177)
  Metals like Pt and Pd can adsorb large volume of hydrogen under specific conditions. Such adsorbed hydrogen by the metal is known as
  A)
                  Occluded hydrogen        done clear
  B)
                  Absorbed hydrogen done clear
  C)
                  Reactive hydrogen          done clear
  D)
                  Atomic hydrogen done clear
  View Solution play_arrow

• question_answer178)
  A colloidal system in which gas bubbles are dispersed in a liquid is known as        [MP PMT 1993]
  A)
                  Foam     done clear
  B)
                  Sol done clear
  C)
                  Aerosol done clear
  D)
                  Emulsion done clear
  View Solution play_arrow

• question_answer179)
  On adding few drops of dilute \[HCl\] or \[FeC{{l}_{3}}\] to freshly precipitated ferric hydroxide a red coloured colloidal solution is obtained. The phenomenon is known as [NCERT 1981; AFMC 1982; MP PMT 1989, 97]
  A)
                  Peptisation         done clear
  B)
                  Dialysis done clear
  C)
                  Protective action              done clear
  D)
                  Dissolution done clear
  View Solution play_arrow

• question_answer180)
  Surface tension of lyophilic sols is             [MP PMT 2002]
  A)
                  Lower than that of \[{{H}_{2}}O\]             done clear
  B)
                  More than that of \[{{H}_{2}}O\] done clear
  C)
                  Equal to that of \[{{H}_{2}}O\]   done clear
  D)
                  None of these done clear
  View Solution play_arrow

• question_answer181)
  Which of the following is not true of a detergent molecule [JIPMER 2002]
  A)
                  It has a non-polar organic part and a polar group done clear
  B)
                  It is not easily biodegraded done clear
  C)
                  It is a sodium salt of fatty acid done clear
  D)
                  It is a surface active agent done clear
  View Solution play_arrow

• question_answer182)
  Which of the following can act as protective colloids
  A)
                  Hydrophobic sols             done clear
  B)
                  Hydrophilic sol done clear
  C)
                  Gold sol                done clear
  D)
                  None of these done clear
  View Solution play_arrow

• question_answer183)
  Which of the following substances is not used for preparing lyophilic sols                                              [MP PET 2002]
  A)
                  Starch   done clear
  B)
                  Gum done clear
  C)
                  Gelatin done clear
  D)
                  Metal sulphide done clear
  View Solution play_arrow

• question_answer184)
  Hydrophilic sols are
  A)
                  Reversible           done clear
  B)
                  Irreversible done clear
  C)
                  Unstable              done clear
  D)
                  None of these done clear
  View Solution play_arrow

• question_answer185)
  Soap essentially forms a colloidal solution in water and removes the greasy matter by
  A)
                  Absorption         done clear
  B)
                  Emulsification done clear
  C)
                  Coagulation        done clear
  D)
                  None of these done clear
  View Solution play_arrow

• question_answer186)
  Toilet soap is a mixture of            [UPSEAT 2001]
  A)
                  Calcium and sodium salts of fatty acids done clear
  B)
                  Fatty acids and glycerol done clear
  C)
                  Sodium salts of fatty acids done clear
  D)
                  Potassium salt of fatty acids        done clear
  View Solution play_arrow

• question_answer187)
  Gold sol is an electronegative sol. The amount of electrolyte required to coagulate a certain amount  of gold sol is minimum in the case of                                                 [KCET (Med.) 2001]
  A)
                  \[CaC{{l}_{2}}\] done clear
  B)
                  \[NaCl\] done clear
  C)
                  \[AlC{{l}_{3}}\] done clear
  D)
                  \[N{{a}_{2}}S{{O}_{4}}\] done clear
  View Solution play_arrow

• question_answer188)
  In the case of small cuts, bleeding is stopped by applying potash alum. Here alum acts as              [KCET (Med.) 2001]
  A)
                  Fungicide             done clear
  B)
                  Disinfectant done clear
  C)
                  Germicide           done clear
  D)
                  Coagulating agent done clear
  View Solution play_arrow

• question_answer189)
  If gold number of A,B,C and D are 0.005, 0.05, 0.5 and 5 respectively, then which of the following will have the highest protective power             [Pb. CET 2001; CPMT 2000]
  A)
                  A             done clear
  B)
                  B done clear
  C)
                  C done clear
  D)
                  D done clear
  View Solution play_arrow

• question_answer190)
  Bredig arc method can not be used to prepare colloidal solution of which of the following             [AFMC 2004]
  A)
                  Pt            done clear
  B)
                  Fe done clear
  C)
                  Ag done clear
  D)
                  Au done clear
  View Solution play_arrow

• question_answer191)
  Gold number is maximum for the lyophilic sol is   [BVP 2004]
  A)
                  Gelatin done clear
  B)
                  Haemoglobin done clear
  C)
                  Sodium oleate   done clear
  D)
                  Potato starch done clear
  View Solution play_arrow

• question_answer192)
  Which of the following is the best protective colloid   [UPSEAT 2004]
  A)
                  Gelatin (Gold No. = 0.005) done clear
  B)
                  Gum arabic  (Gold No. = 0.15) done clear
  C)
                  Egg albumin  (Gold No. = 0.08) done clear
  D)
                  None of these done clear
  View Solution play_arrow

• question_answer193)
  The gold number of A, B C and D are 0.04, 0.002, 10 and 25 respectively. Protective power of A, B, C and D are in order                    [DCE 2003]
  A)
                  \[A>B>C>D\]     done clear
  B)
                  \[B>A>C>D\] done clear
  C)
                  \[D>C>B>A\]     done clear
  D)
                  \[C>A>B>D\] done clear
  View Solution play_arrow

• question_answer194)
  A catalyst is a substance which                   [Pb. CET 2004]
  A)
                  Is always in the same phase as in the reactions done clear
  B)
                  Alters the equilibrium in a reaction done clear
  C)
                  Does not participate in the reaction but alters the rate of reaction done clear
  D)
                  Participates in the reaction and provide an easier pathway for the same done clear
  View Solution play_arrow

• question_answer195)
  Cod liver oil is                                     [MHCET 2004]
  A)
                  An emulsion       done clear
  B)
                  Solution done clear
  C)
                  Colloidal solution              done clear
  D)
                  Suspension done clear
  View Solution play_arrow

• question_answer196)
  Paste is                                                 [MHCET 2004]
  A)
                  Suspension of solid in a liquid done clear
  B)
                  Mechanical dispersion of a solid in liquid  done clear
  C)
                  Colloidal solution of a solid in solid done clear
  D)
                  None of these done clear
  View Solution play_arrow

• question_answer197)
  A precipitate is changed to colloidal solution by the following process                                     [UPSEAT 2004]
  A)
                  Dialysis done clear
  B)
                  Ultrafiltration done clear
  C)
                  Peptization         done clear
  D)
                  Electrophoresis done clear
  View Solution play_arrow

• question_answer198)
  An aerosol is a                                                   [UPSEAT 2004]
  A)
                  Dispersion of a solid or liquid in a gas done clear
  B)
                  Dispersion of a solid in a liquid done clear
  C)
                  Dispersion of a liquid in a liquid done clear
  D)
                  Solid solution done clear
  View Solution play_arrow

• question_answer199)
  Lyophilic sols are              [IIT 2005]
  A)
                  Irreversible sols                done clear
  B)
                  They are prepared from inorganic compound done clear
  C)
                  Coagulated by adding electrolytes done clear
  D)
                  Self-stabilizing done clear
  View Solution play_arrow

• question_answer200)
  The volume of a colloidal particle, \[{{V}_{C}}\] as compared to the volume of a solute particle in a true solution \[{{V}_{S}},\] could be [AIEEE 2005]
  A)
                  \[\frac{{{V}_{C}}}{{{V}_{S}}}\tilde{}1\]   done clear
  B)
                  \[\frac{{{V}_{C}}}{{{V}_{S}}}\tilde{}{{10}^{23}}\] done clear
  C)
                  \[\frac{{{V}_{C}}}{{{V}_{S}}}\tilde{}{{10}^{-3}}\] done clear
  D)
                  \[\frac{{{V}_{C}}}{{{V}_{S}}}\tilde{}{{10}^{3}}\] done clear
  View Solution play_arrow

• question_answer201)
  The disperse phase in colloidal iron (III) hydroxide and colloidal gold is positively and negatively charged, respectivley. Which of the following statements is NOT correct             [AIEEE 2005]
  A)
                  Magnesium chloride solution coagulates, the gold sol more readily than the iron (III) hydroxide sol done clear
  B)
                  Sodium sulphate solution causes coagulation in both sols done clear
  C)
                  Mixing the sols has no effect done clear
  D)
                  Coagulation in both sols can be brought about by electrophoresis done clear
  View Solution play_arrow

• question_answer202)
  The surface tension of which of the following liquid is maximum ?            [CBSE PMT 2005]
  A)
                  \[{{H}_{2}}O\]   done clear
  B)
                  \[{{C}_{6}}{{H}_{6}}\] done clear
  C)
                  \[C{{H}_{3}}OH\]              done clear
  D)
                  \[{{C}_{2}}{{H}_{5}}OH\] done clear
  View Solution play_arrow

• question_answer203)
  Which one of the following forms micelles in aqueous solution above certain concentration ?     [CBSE PMT 2005]
  A)
                  Urea done clear
  B)
                  Dodecyl trimethyl ammonium chloride done clear
  C)
                  Pyridinium chloride done clear
  D)
                  Glucose done clear
  View Solution play_arrow

• question_answer204)
  Alum is a water purifier because it           [KCET 2005]
  A)
                  Coagulates the impurities                            done clear
  B)
                  Softens hard water done clear
  C)
                  Gives taste done clear
  D)
                  Destroys the pathogenic bacteria done clear
  View Solution play_arrow

• question_answer205)
  An emulsifier is a substance which           [KCET 2005]
  A)
                  Stabilises the emulsion                  done clear
  B)
                  Homogenises the emulsion done clear
  C)
                  Coagulates the emulsion                              done clear
  D)
                  Accelerates the dispersion of liquid in liquid done clear
  View Solution play_arrow

• question_answer206)
  Muddy water can be purified through coagulation using [J & K 2005]
  A)
                  Common salt     done clear
  B)
                  Alums done clear
  C)
                  Sand      done clear
  D)
                  Lime done clear
  View Solution play_arrow

• question_answer207)
  Fog is a colloidal solution of         [J & K 2005]
  A)
                  Solid in gas          done clear
  B)
                  Liquid in gas done clear
  C)
                  Gas in liquid        done clear
  D)
                  Gas in solid done clear
  View Solution play_arrow

• question_answer208)
  Lyophilic sols are more stable than lyophobic sols because their particles are       [Karala CET 2005]
  A)
                  Positively charged           done clear
  B)
                  Negatively charged done clear
  C)
                  All soluble           done clear
  D)
                  Attract each other done clear
  E)
                  Are heavier done clear
  View Solution play_arrow

• question_answer209)
  Oils and fats are obtained by saponification of potassium stearate. Its formula is \[C{{H}_{3}}-{{(C{{H}_{2}})}_{16}}-CO{{O}^{-}}{{K}^{+}}\]. Lyophobic end of atom is \[(C{{H}_{3}})\] and lyophilic end is \[CO{{O}^{-}}{{K}^{+}}\]. potassium stearate is example of  [Kerala CET 2005]
  A)
                  Lyophobic colloids           done clear
  B)
                  Lyophilic colloids done clear
  C)
                  Poly molecular colloids  done clear
  D)
                  Macromolecular colloids done clear
  E)
                  Combined colloids or Miscells done clear
  View Solution play_arrow