question_answer 1)
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_answer 2)
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_answer 3)
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_answer 4)
\[A{{s}_{2}}{{S}_{3}}\] 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_answer 5)
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_answer 6)
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_answer 7)
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_answer 8)
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_answer 9)
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_answer 10)
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_answer 11)
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_answer 12)
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_answer 13)
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_answer 14)
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_answer 15)
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_answer 16)
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_answer 17)
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_answer 18)
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_answer 19)
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_answer 20)
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_answer 21)
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_answer 22)
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_answer 23)
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_answer 24)
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_answer 25)
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_answer 26)
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_answer 27)
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_answer 28)
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_answer 29)
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_answer 30)
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_answer 31)
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_answer 32)
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_answer 33)
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_answer 34)
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_answer 35)
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_answer 36)
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_answer 37)
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_answer 38)
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_answer 39)
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_answer 40)
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_answer 41)
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_answer 42)
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_answer 43)
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_answer 44)
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_answer 45)
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_answer 46)
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_answer 47)
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_answer 48)
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_answer 49)
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_answer 50)
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_answer 51)
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_answer 52)
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_answer 53)
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_answer 54)
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_answer 55)
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_answer 56)
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_answer 57)
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_answer 58)
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_answer 59)
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_answer 60)
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_answer 61)
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_answer 62)
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_answer 63)
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_answer 64)
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_answer 65)
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_answer 66)
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_answer 67)
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_answer 68)
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_answer 69)
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_answer 70)
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_answer 71)
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_answer 72)
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_answer 73)
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_answer 74)
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_answer 75)
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_answer 76)
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_answer 77)
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_answer 78)
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_answer 79)
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_answer 80)
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_answer 81)
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_answer 82)
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_answer 83)
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_answer 84)
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_answer 85)
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_answer 86)
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_answer 87)
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_answer 88)
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_answer 89)
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_answer 90)
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_answer 91)
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_answer 92)
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_answer 93)
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_answer 94)
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_answer 95)
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_answer 96)
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_answer 97)
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_answer 98)
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_answer 99)
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_answer 100)
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_answer 101)
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_answer 102)
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_answer 103)
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_answer 104)
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_answer 105)
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_answer 106)
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_answer 107)
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_answer 108)
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_answer 109)
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_answer 110)
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_answer 111)
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_answer 112)
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_answer 113)
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_answer 114)
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_answer 115)
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_answer 116)
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_answer 117)
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_answer 118)
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_answer 119)
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_answer 120)
?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_answer 121)
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_answer 122)
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_answer 123)
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_answer 124)
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_answer 125)
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_answer 126)
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_answer 127)
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_answer 128)
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_answer 129)
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_answer 130)
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_answer 131)
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_answer 132)
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_answer 133)
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_answer 134)
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_answer 135)
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_answer 136)
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_answer 137)
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_answer 138)
\[Fe{{(OH)}_{3}}\] 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_answer 139)
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_answer 140)
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_answer 141)
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_answer 142)
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_answer 143)
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_answer 144)
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_answer 145)
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_answer 146)
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_answer 147)
Which of the following molecules is most suitable to disperse benzene in water [AIIMS 2005]
A)
B)
C)
D)
View Solution play_arrow
question_answer 148)
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_answer 149)
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_answer 150)
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_answer 151)
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_answer 152)
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_answer 153)
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_answer 154)
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_answer 155)
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_answer 156)
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_answer 157)
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_answer 158)
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_answer 159)
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_answer 160)
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_answer 161)
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_answer 162)
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_answer 163)
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_answer 164)
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_answer 165)
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_answer 166)
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_answer 167)
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_answer 168)
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_answer 169)
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_answer 170)
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_answer 171)
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
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question_answer 172)
Which of the following ions can cause coagulation of proteins [KCET 2000]
A)
\[A{{g}^{+}}\] done
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B)
\[N{{a}^{+}}\] done
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C)
\[M{{g}^{++}}\] done
clear
D)
\[C{{a}^{++}}\] done
clear
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question_answer 173)
Light scattering takes place in [MP PMT 1991; BHU 2000; AFMC 2001; Kerala PET 2002]
A)
Solutions of electrolyte done
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B)
Colloidal solutions done
clear
C)
Electrodialysis done
clear
D)
Electroplating done
clear
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question_answer 174)
Which of the following can stabilize gold sol from coagulation by \[NaCl\] solution
A)
\[Fe{{(OH)}_{3}}\] done
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B)
Gelatin done
clear
C)
\[A{{s}_{2}}{{S}_{3}}\] done
clear
D)
None of these done
clear
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question_answer 175)
At isoelectric point
A)
Colloidal sol becomes highly stable done
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B)
Precipitation of a colloidal sol takes place done
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C)
Colloidal particles becomes uncharged done
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D)
Peptization can be carried out done
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question_answer 176)
Which one is an example of multimolecular colloid system
A)
Soap dispersed in water done
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B)
Protein dispersed in water done
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C)
Gold dispersed in water done
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D)
Gum dispersed in water done
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question_answer 177)
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
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B)
Absorbed hydrogen done
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C)
Reactive hydrogen done
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D)
Atomic hydrogen done
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question_answer 178)
A colloidal system in which gas bubbles are dispersed in a liquid is known as [MP PMT 1993]
A)
Foam done
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B)
Sol done
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C)
Aerosol done
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D)
Emulsion done
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question_answer 179)
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
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question_answer 180)
Surface tension of lyophilic sols is [MP PMT 2002]
A)
Lower than that of \[{{H}_{2}}O\] done
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B)
More than that of \[{{H}_{2}}O\] done
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C)
Equal to that of \[{{H}_{2}}O\] done
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D)
None of these done
clear
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question_answer 181)
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
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B)
It is not easily biodegraded done
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C)
It is a sodium salt of fatty acid done
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D)
It is a surface active agent done
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question_answer 182)
Which of the following can act as protective colloids
A)
Hydrophobic sols done
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B)
Hydrophilic sol done
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C)
Gold sol done
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D)
None of these done
clear
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question_answer 183)
Which of the following substances is not used for preparing lyophilic sols [MP PET 2002]
A)
Starch done
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B)
Gum done
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C)
Gelatin done
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D)
Metal sulphide done
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question_answer 184)
Hydrophilic sols are
A)
Reversible done
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B)
Irreversible done
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C)
Unstable done
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D)
None of these done
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question_answer 185)
Soap essentially forms a colloidal solution in water and removes the greasy matter by
A)
Absorption done
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B)
Emulsification done
clear
C)
Coagulation done
clear
D)
None of these done
clear
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question_answer 186)
Toilet soap is a mixture of [UPSEAT 2001]
A)
Calcium and sodium salts of fatty acids done
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B)
Fatty acids and glycerol done
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C)
Sodium salts of fatty acids done
clear
D)
Potassium salt of fatty acids done
clear
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question_answer 187)
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
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B)
\[NaCl\] done
clear
C)
\[AlC{{l}_{3}}\] done
clear
D)
\[N{{a}_{2}}S{{O}_{4}}\] done
clear
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question_answer 188)
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
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question_answer 189)
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
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question_answer 190)
Bredig arc method can not be used to prepare colloidal solution of which of the following [AFMC 2004]
A)
Pt done
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B)
Fe done
clear
C)
Ag done
clear
D)
Au done
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question_answer 191)
Gold number is maximum for the lyophilic sol is [BVP 2004]
A)
Gelatin done
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B)
Haemoglobin done
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C)
Sodium oleate done
clear
D)
Potato starch done
clear
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question_answer 192)
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
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question_answer 193)
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
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B)
\[B>A>C>D\] done
clear
C)
\[D>C>B>A\] done
clear
D)
\[C>A>B>D\] done
clear
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question_answer 194)
A catalyst is a substance which [Pb. CET 2004]
A)
Is always in the same phase as in the reactions done
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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
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question_answer 195)
Cod liver oil is [MHCET 2004]
A)
An emulsion done
clear
B)
Solution done
clear
C)
Colloidal solution done
clear
D)
Suspension done
clear
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question_answer 196)
Paste is [MHCET 2004]
A)
Suspension of solid in a liquid done
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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
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question_answer 197)
A precipitate is changed to colloidal solution by the following process [UPSEAT 2004]
A)
Dialysis done
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B)
Ultrafiltration done
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C)
Peptization done
clear
D)
Electrophoresis done
clear
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question_answer 198)
An aerosol is a [UPSEAT 2004]
A)
Dispersion of a solid or liquid in a gas done
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B)
Dispersion of a solid in a liquid done
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C)
Dispersion of a liquid in a liquid done
clear
D)
Solid solution done
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question_answer 199)
Lyophilic sols are [IIT 2005]
A)
Irreversible sols done
clear
B)
They are prepared from inorganic compound done
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C)
Coagulated by adding electrolytes done
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D)
Self-stabilizing done
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question_answer 200)
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
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B)
\[\frac{{{V}_{C}}}{{{V}_{S}}}\tilde{}{{10}^{23}}\] done
clear
C)
\[\frac{{{V}_{C}}}{{{V}_{S}}}\tilde{}{{10}^{-3}}\] done
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D)
\[\frac{{{V}_{C}}}{{{V}_{S}}}\tilde{}{{10}^{3}}\] done
clear
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question_answer 201)
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
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question_answer 202)
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
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question_answer 203)
Which one of the following forms micelles in aqueous solution above certain concentration ? [CBSE PMT 2005]
A)
Urea done
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B)
Dodecyl trimethyl ammonium chloride done
clear
C)
Pyridinium chloride done
clear
D)
Glucose done
clear
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question_answer 204)
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
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question_answer 205)
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
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question_answer 206)
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
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question_answer 207)
Fog is a colloidal solution of [J & K 2005]
A)
Solid in gas done
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B)
Liquid in gas done
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C)
Gas in liquid done
clear
D)
Gas in solid done
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question_answer 208)
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
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question_answer 209)
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
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