JEE Main & Advanced Chemistry Chemical Bonding and Molecular Structure / रासायनिक आबंधन एवं आणविक संरचना Question Bank

done Covalent bonding Total Questions - 76

• question_answer1)
  The valency of sulphur in sulphuric acid is             [NCERT  1974]
  A)
                  2              done clear
  B)
                  4 done clear
  C)
                  6              done clear
  D)
                  8 done clear
  View Solution play_arrow

• question_answer2)
  The number of electrons involved in the bond formation of \[{{N}_{2}}\]molecule                                    [IIT 1980; CPMT 1983, 84, 85; CBSE PMT 1992]
  A)
                  2              done clear
  B)
                  4 done clear
  C)
                  6              done clear
  D)
                  10 done clear
  View Solution play_arrow

• question_answer3)
  The electronic configuration of four elements are given in brackets \[L\,\left( 1{{s}^{2}},\,\,2{{s}^{2}}2{{p}^{1}} \right);\,\,M\,\left( 1{{s}^{2}},\,\,2{{s}^{2}}\,2{{p}^{5}} \right)\] \[Q\,\left( 1{{s}^{2}},\,\,2{{s}^{2}}\,2{{p}^{6}},\,\,3{{s}^{1}} \right);\,\,R\,\left( 1{{s}^{2}},\,\,2{{s}^{2}}\,2{{p}^{2}} \right)\] The element that would most readily form a diatomic molecule is                                                                                 [NCERT 1983]
  A)
                  Q             done clear
  B)
                  M done clear
  C)
                  R             done clear
  D)
                  L done clear
  View Solution play_arrow

• question_answer4)
  In covalency       [CPMT 1974, 76, 78, 81; AFMC 1982]
  A)
                  Electrons are transferred done clear
  B)
                  Electrons are equally shared done clear
  C)
                  The electron of one atom are shared between two atoms done clear
  D)
                  None of the above done clear
  View Solution play_arrow

• question_answer5)
  Which compound is highest covalent
  A)
                  \[LiCl\]  done clear
  B)
                  \[LiF\] done clear
  C)
                  \[LiBr\] done clear
  D)
                  LiI done clear
  View Solution play_arrow

• question_answer6)
  The nature of bonding in graphite is [DPMT 1986; CPMT 1986]
  A)
                  Covalent              done clear
  B)
                  Ionic done clear
  C)
                  Metallic                done clear
  D)
                  Coordinate done clear
  View Solution play_arrow

• question_answer7)
  Which of the following substances has giant covalent structure                  [DPMT 1985, 86; NCERT 1975]
  A)
                  Iodine crystal     done clear
  B)
                  Solid \[C{{O}_{2}}\] done clear
  C)
                  Silica      done clear
  D)
                  White phosphorus done clear
  View Solution play_arrow

• question_answer8)
  With which of the given pairs CO2 resembles      [BHU 2005]
  A)
                  HgCl2, C2H2          done clear
  B)
                  HgCl2, SnCl4 done clear
  C)
                  C2H2, NO2            done clear
  D)
                  N2O and NO2 done clear
  View Solution play_arrow

• question_answer9)
  The electron pair which forms a bond between two similar non-metallic atoms will be    [IIT 1986]
  A)
                  Dissimilar shared between the two done clear
  B)
                  By complete transfer from one atom to other done clear
  C)
                  In a similar spin condition done clear
  D)
                  Equally shared in between the two done clear
  View Solution play_arrow

• question_answer10)
  For the formation of covalent bond, the difference in the value of electronegativities should be               [EAMCET 1982]
  A)
                  Equal to or less than 1.7                done clear
  B)
                  More than 1.7 done clear
  C)
                  1.7 or more         done clear
  D)
                  None of these done clear
  View Solution play_arrow

• question_answer11)
  Which type of bond is formed between similar atoms
  A)
                  Ionic      done clear
  B)
                  Covalent done clear
  C)
                  Coordinate         done clear
  D)
                  Metallic done clear
  View Solution play_arrow

• question_answer12)
  Covalent compounds are generally ...... in water [CPMT 1987]
  A)
                  Soluble done clear
  B)
                  Insoluble done clear
  C)
                  Dissociated         done clear
  D)
                  Hydrolysed done clear
  View Solution play_arrow

• question_answer13)
  Which one is the electron deficient compound  [AIIMS 1982]
  A)
                  \[ICl\]    done clear
  B)
                  \[N{{H}_{3}}\] done clear
  C)
                  \[BC{{l}_{3}}\]   done clear
  D)
                  \[PC{{l}_{3}}\] done clear
  View Solution play_arrow

• question_answer14)
  Which among the following elements has the tendency to form covalent compounds
  A)
                  \[Ba\]    done clear
  B)
                  \[Be\] done clear
  C)
                  \[Mg\]  done clear
  D)
                  \[Ca\] done clear
  View Solution play_arrow

• question_answer15)
   Silicon has 4 electrons in the outermost orbit. In forming the bonds                                        [EAMCET 1981]
  A)
                  It gains electrons              done clear
  B)
                  It loses electrons done clear
  C)
                  It shares electrons           done clear
  D)
                  None of these done clear
  View Solution play_arrow

• question_answer16)
  Which of the following occurs when two hydrogen atoms bond with each others
  A)
                  Potential energy is lowered done clear
  B)
                  Kinetic energy is lowered done clear
  C)
                  Electronic motion ceases done clear
  D)
                  Energy is absorbed done clear
  View Solution play_arrow

• question_answer17)
  A bond with maximum covalent character between non-metallic elements is formed     [NCERT 1982]
  A)
                  Between identical atoms done clear
  B)
                  Between chemically similar atoms done clear
  C)
                  Between atoms of widely different electronegativities done clear
  D)
                  Between atoms of the same size done clear
  View Solution play_arrow

• question_answer18)
  Amongst the following covalent bonding is found in [CPMT 1973]
  A)
                  Sodium chloride               done clear
  B)
                  Magnesium chloride done clear
  C)
                  Water   done clear
  D)
                  Brass done clear
  View Solution play_arrow

• question_answer19)
  Indicate the nature of bonding in diamond                                                                         [EAMCET 1980; BHU 1996; KCET 2000]
  A)
                  Covalent              done clear
  B)
                  Ionic done clear
  C)
                  Coordinate         done clear
  D)
                  Hydrogen done clear
  View Solution play_arrow

• question_answer20)
  Octet rule is not valid for the molecule [IIT 1979; MP PMT 1995]
  A)
                  \[C{{O}_{2}}\]    done clear
  B)
                  \[{{H}_{2}}O\] done clear
  C)
                  \[CO\]   done clear
  D)
                  \[{{O}_{2}}\] done clear
  View Solution play_arrow

• question_answer21)
  Which of the following compounds are covalent [IIT 1980; MLNR 1982]
  A)
                  \[{{H}_{2}}\]       done clear
  B)
                  \[CaO\] done clear
  C)
                  \[KCl\]  done clear
  D)
                  \[N{{a}_{2}}S\] done clear
  View Solution play_arrow

• question_answer22)
  Indicate the nature of bonding in \[CC{{l}_{4}}\] and \[2s\] [NCERT 1973]
  A)
                  Covalent in \[CC{{l}_{4}}\] and electrovalent in \[Ca{{H}_{2}}\] done clear
  B)
                  Electrovalent in both \[CC{{l}_{4}}\] and \[Ca{{H}_{2}}\] done clear
  C)
                  Covalent in both \[CC{{l}_{4}}\]and \[Ca{{H}_{2}}\] done clear
  D)
                  Electrovalent in \[CC{{l}_{4}}\] and covalent in \[Ca{{H}_{2}}\] done clear
  View Solution play_arrow

• question_answer23)
  If the atomic number of element \[X\] is 7, the best electron dot symbol for the element is             [NCERT 1973; CPMT 2003]
  A)
                  \[X\,\,.\]              done clear
  B)
                  \[.\,\,X\,\,.\] done clear
  C)
                  \[.\,\,\underset{.}{\overset{.}{\mathop{X}}}\,\,\,:\]       done clear
  D)
                  \[:\,\,\underset{.\,.}{\overset{.\,.}{\mathop{X}}}\,\,\,.\] done clear
  View Solution play_arrow

• question_answer24)
  Which is the most covalent          [AFMC 1982]
  A)
                  \[C-O\] done clear
  B)
                  \[C-Br\] done clear
  C)
                  \[C-S\]  done clear
  D)
                  \[C-F\] done clear
  View Solution play_arrow

• question_answer25)
  The covalent compound \[HCl\] has the ionic character as [EAMCET 1980]
  A)
                  The electronegativity of hydrogen is greater than that of chlorine done clear
  B)
                  The electronegativity of hydrogen is equal to that of chlorine done clear
  C)
                  The electronegativity of chlorine is greater than that of hydrogen done clear
  D)
                  Hydrogen and chlorine are gases done clear
  View Solution play_arrow

• question_answer26)
  The correct sequence of increasing covalent character is represented by              [CBSE PMT 2005]
  A)
                  \[LiCl<NaCl<BeC{{l}_{2}}\]           done clear
  B)
                  \[BeC{{l}_{2}}<NaCl<LiCl\]           done clear
  C)
                  \[NaCl<LiCl<BeC{{l}_{2}}\]           done clear
  D)
                  \[BeC{{l}_{2}}<LiCl<NaCl\] done clear
  View Solution play_arrow

• question_answer27)
  Bond energy of covalent \[O-H\]bond in water is [EAMCET 1982]
  A)
                  Greater than bond energy of \[H-\]bond done clear
  B)
                  Equal to bond energy of \[H-\]bond done clear
  C)
                  Less than bond energy of \[H-\]bond done clear
  D)
                  None of these done clear
  View Solution play_arrow

• question_answer28)
  Solid \[C{{H}_{4}}\] is                                     [DPMT 1983]
  A)
                  Molecular solid done clear
  B)
                  Ionic solid done clear
  C)
                  Pseudo solid      done clear
  D)
                  Does not exist done clear
  View Solution play_arrow

• question_answer29)
  A covalent bond is likely to be formed between two elements which                                      [MP PMT 1987]
  A)
                  Have similar electronegativities done clear
  B)
                  Have low ionization energies      done clear
  C)
                  Have low melting points               done clear
  D)
                  Form ions with a small charge done clear
  View Solution play_arrow

• question_answer30)
  The bond between two identical non-metal atoms has a pair of electrons                                             [CPMT 1986]
  A)
                  Unequally shared between the two done clear
  B)
                  Transferred fully from one atom to another done clear
  C)
                  With identical spins done clear
  D)
                  Equally shared between them done clear
  View Solution play_arrow

• question_answer31)
  The valency of phosphorus in \[{{H}_{3}}P{{O}_{4}}\]is  [DPMT 1984]
  A)
                  2              done clear
  B)
                  5 done clear
  C)
                  4              done clear
  D)
                  1 done clear
  View Solution play_arrow

• question_answer32)
  Which of the following substances has covalent bonding                                                                 [AMU 1985]
  A)
                  Germanium        done clear
  B)
                  Sodium chloride done clear
  C)
                  Solid neon           done clear
  D)
                  Copper done clear
  View Solution play_arrow

• question_answer33)
  The covalency of nitrogen in \[HN{{O}_{3}}\] is  [CPMT 1987]
  A)
                  0              done clear
  B)
                  3 done clear
  C)
                  4              done clear
  D)
                  5 done clear
  View Solution play_arrow

• question_answer34)
  Hydrogen chloride molecule contains a  [CPMT 1984]
  A)
                  Covalent bond  done clear
  B)
                  Double bond done clear
  C)
                  Coordinate bond              done clear
  D)
                  Electrovalent bond done clear
  View Solution play_arrow

• question_answer35)
  As compared to covalent compounds, electrovalent compounds generally have [CPMT 1990, 94; MP PMT 1997]
  A)
                  Low melting points and low boiling points done clear
  B)
                  Low melting points and high boiling points done clear
  C)
                  High melting points and low boiling points done clear
  D)
                  High melting points and high boiling points done clear
  View Solution play_arrow

• question_answer36)
  The interatomic distances in \[{{H}_{2}}\] and \[C{{l}_{2}}\] molecules are 74 and 198 pm respectively. The bond length of \[HCl\] is [MP PET 1993]
  A)
                  272 pm done clear
  B)
                  136 pm done clear
  C)
                  124 pm done clear
  D)
                  248 pm done clear
  View Solution play_arrow

• question_answer37)
  On analysis, a certain compound was found to contain iodine and oxygen in the ratio of \[254\,\,gm\] of iodine and \[80\,\,gm\] of oxygen. The atomic mass of iodine is 127 and that of oxygen is 16. Which of the following is the formula of the compound                                  [CPMT 1981]
  A)
                  \[IO\]    done clear
  B)
                  \[{{I}_{2}}O\] done clear
  C)
                  \[{{I}_{5}}{{O}_{2}}\]      done clear
  D)
                  \[{{I}_{2}}{{O}_{5}}\] done clear
  View Solution play_arrow

• question_answer38)
  Ionic and covalent bonds are present in                                                 [CBSE PMT 1990; MNR 1990; KCET 2000; UPSEAT 2001]
  A)
                  \[CC{{l}_{4}}\]   done clear
  B)
                  \[CaC{{l}_{2}}\] done clear
  C)
                  \[N{{H}_{4}}Cl\]                done clear
  D)
                  \[{{H}_{2}}O\] done clear
  View Solution play_arrow

• question_answer39)
  Highest covalent character is found in    [EAMCET 1992]
  A)
                  \[Ca{{F}_{2}}\]  done clear
  B)
                  \[CaC{{l}_{2}}\] done clear
  C)
                  \[CaB{{r}_{2}}\]                done clear
  D)
                  \[Ca{{I}_{2}}\] done clear
  View Solution play_arrow

• question_answer40)
  Among the following which property is commonly exhibited by a covalent compound    [MP PET 1994]
  A)
                  High solubility in water  done clear
  B)
                  High electrical conductance done clear
  C)
                  Low boiling point done clear
  D)
                  High melting point done clear
  View Solution play_arrow

• question_answer41)
  Atoms in the water molecule are linked by          [MP PAT 1996]
  A)
                  Electrovalent bond          done clear
  B)
                  Covalent bond done clear
  C)
                  Coordinate covalent bond done clear
  D)
                  Odd electron bond done clear
  View Solution play_arrow

• question_answer42)
  Which is the correct electron dot structure of \[{{N}_{2}}O\]molecule    [MP PET 1996]
  A)
    \[:\,N=N=\underset{.\,.}{\overset{.\,.}{\mathop{O}}}\,\]          done clear
  B)
                  \[:\,N\equiv {{N}^{+}}-\underset{.\,.}{\overset{.\,.}{\mathop{O}}}\,{{:}^{-}}\] done clear
  C)
  \[\underset{.\,.}{\overset{.\,.}{\mathop{N}}}\,=\overset{.\,.}{\mathop{N}}\,=\underset{.\,.}{\overset{.\,.}{\mathop{O}}}\,\]                done clear
  D)
                  \[:\,N=N=\underset{.\,.}{\overset{.\,.}{\mathop{O}}}\,:\] done clear
  View Solution play_arrow

• question_answer43)
  A covalent bond between two atoms is formed by which of the following                                            [MP PMT 1996]
  A)
                  Electron nuclear attraction done clear
  B)
                  Electron sharing done clear
  C)
                  Electron transfer done clear
  D)
                  Electrostatic attraction done clear
  View Solution play_arrow

• question_answer44)
  The electronic configuration of a metal \[M\] is \[1{{s}^{2}},\,\,2{{s}^{2}}\,2{{p}^{6}},\,\,3{{s}^{1}}.\]  The formula of its oxides will be [MP PET/PMT 1998]
  A)
                  \[MO\] done clear
  B)
                  \[{{M}_{2}}O\] done clear
  C)
                  \[{{M}_{2}}{{O}_{3}}\]   done clear
  D)
                  \[M{{O}_{2}}\] done clear
  View Solution play_arrow

• question_answer45)
  Which of the following statements regarding covalent bond is not true                                  [MP PET/PMT 1998]
  A)
                  The electrons are shared between atoms done clear
  B)
                  The bond is non-directional done clear
  C)
                  The strength of the bond depends upon the extent of overlapping done clear
  D)
                  The bond formed may or may not be polar done clear
  View Solution play_arrow

• question_answer46)
  If the electronic configuration of \[M=2,\,\,8,\,\,3\] and that of \[A=2,\,\,8,\,\,7,\] the formula of the compound is [Bihar MEE 1996]
  A)
                  \[{{M}_{2}}{{A}_{3}}\]   done clear
  B)
                  \[M{{A}_{2}}\] done clear
  C)
                  \[{{M}_{2}}A\]  done clear
  D)
                  \[M{{A}_{3}}\] done clear
  E)
                  \[{{M}_{3}}A\] done clear
  View Solution play_arrow

• question_answer47)
  The table shown below gives the bond dissociation energies \[({{E}_{diss}})\] for single covalent bonds of carbon  atoms with element \[A,\,\,B,\,\,C\]and \[D.\] Which element has the smallest atoms                [CBSE PMT 1994]

  Bond	\[{{E}_{diss}}\,(kJ\,\,mo{{l}^{-1}})\]
  \[C-A\]	240
  \[C-B\]	328
  \[C-C\]	276
  \[C-D\]	485

  A)
                  A             done clear
  B)
                  B done clear
  C)
                  C             done clear
  D)
                  D done clear
  View Solution play_arrow

• question_answer48)
  If a molecule \[{{X}_{2}}\] has a triple bond, then \[X\]will have the electronic configuration        [CET Pune 1998]
  A)
                  \[1{{s}^{2}}\,\,2{{s}^{2}}\,2{{p}^{5}}\]    done clear
  B)
                  \[1{{s}^{2}}\,\,2{{s}^{2}}\,2{{p}^{3}}\] done clear
  C)
                  \[1{{s}^{2}}\,2{{s}^{1}}\]               done clear
  D)
                  \[1{{s}^{2}}\,2{{s}^{2}}\,2{{p}^{1}}\] done clear
  View Solution play_arrow

• question_answer49)
  Which of the following compounds does not follow the octet rule for electron distribution           [CET Pune 1998]
  A)
                  \[PC{{l}_{5}}\]   done clear
  B)
                  \[PC{{l}_{3}}\] done clear
  C)
                  \[{{H}_{2}}O\]   done clear
  D)
                  \[P{{H}_{3}}\] done clear
  View Solution play_arrow

• question_answer50)
  The valency of \[A=3\] and \[B=2\], then the compound is [Bihar MEE 1997]
  A)
                  \[{{A}_{2}}{{B}_{3}}\]     done clear
  B)
                  \[{{A}_{3}}{{B}_{2}}\] done clear
  C)
                  \[{{A}_{3}}{{B}_{3}}\]     done clear
  D)
                  \[{{A}_{2}}{{B}_{2}}\] done clear
  E)
                  None of these done clear
  View Solution play_arrow

• question_answer51)
  The number of electrons shared by each outermost shell of \[{{N}_{2}}\] is                                         [AFMC 1998]
  A)
                  2              done clear
  B)
                  3              done clear
  C)
                  4              done clear
  D)
                  5 done clear
  View Solution play_arrow

• question_answer52)
  Which of the following substances when dissolved in water will give a solution that does not conduct electricity [JIPMER 1999]
  A)
                  Hydrogen chloride           done clear
  B)
                  Potassium hydroxide done clear
  C)
                  Sodium acetate                done clear
  D)
                  Urea done clear
  View Solution play_arrow

• question_answer53)
  Which of the following atoms has minimum covalent radius [DPMT 2000]
  A)
                  B             done clear
  B)
                  C done clear
  C)
                  N             done clear
  D)
                  Si done clear
  View Solution play_arrow

• question_answer54)
  Boron form covalent compound due to [Pb. PMT 2000]
  A)
                  Small size             done clear
  B)
                  Higher ionization energy done clear
  C)
                  Lower ionization energy               done clear
  D)
                  Both A and B done clear
  View Solution play_arrow

• question_answer55)
  Two elements X and Y have following electron configurations  X \[=1{{s}^{2}},\,\,2{{s}^{2}}2{{p}^{6}},\,\,3{{s}^{2}}3{{p}^{6}},\,\,4{{s}^{2}}\] and Y \[=1{{s}^{2}},\,\,2{{s}^{2}}2{{p}^{6}},\,\,3{{s}^{2}}3{{p}^{6}}\] The compound formed by combination of X and Y is [DPMT 2001]
  A)
                  \[X{{Y}_{5}}\]     done clear
  B)
                  \[{{X}_{2}}{{Y}_{5}}\] done clear
  C)
                  \[{{X}_{5}}{{Y}_{3}}\]      done clear
  D)
                  \[X{{Y}_{2}}\] done clear
  View Solution play_arrow

• question_answer56)
  Covalent compounds have low melting point because    [KCET 2002]
  A)
                  Covalent bond is less exothermic done clear
  B)
                          Covalent molecules have definite shape done clear
  C)
                  Covalent bond is weaker than ionic bond done clear
  D)
                  Covalent molecules are held by weak Vander Waal?s force of attraction done clear
  View Solution play_arrow

• question_answer57)
  p and n-type of semiconductors are formed due to [UPSEAT 2002]
  A)
                  Covalent bonds                done clear
  B)
                  Metallic bonds done clear
  C)
                  Ionic bonds         done clear
  D)
                  Co-ordinate bond done clear
  View Solution play_arrow

• question_answer58)
  Which of the following is Lewis acid         [RPET 2003]
  A)
                  \[B{{F}_{3}}\]     done clear
  B)
                  \[N{{H}_{3}}\] done clear
  C)
                  \[P{{H}_{3}}\]    done clear
  D)
                  \[S{{O}_{2}}\] done clear
  View Solution play_arrow

• question_answer59)
  Among the species : \[C{{O}_{2}},C{{H}_{3}}CO{{O}^{-}},\] \[CO,C{{O}_{3}}^{2-},\] HCHO which has the weakest carbon- oxygen bond [Kerala PMT 2004]
  A)
                  \[C{{O}_{2}}\]    done clear
  B)
                  \[C{{H}_{3}}CO{{O}^{-}}\] done clear
  C)
                  CO          done clear
  D)
                  \[C{{O}_{3}}^{2-}\] done clear
  E)
                  HCHO done clear
  View Solution play_arrow

• question_answer60)
  Valency of sulphur in \[N{{a}_{2}}{{S}_{2}}{{O}_{3}}\]is  [DPMT 1984]
  A)
                  Two       done clear
  B)
                  Three done clear
  C)
                  Four       done clear
  D)
                  Six done clear
  View Solution play_arrow

• question_answer61)
   The acid having \[O-O\] bond is                                                                 [IIT JEE Screening 2004]
  A)
                  \[{{H}_{2}}{{S}_{2}}{{O}_{3}}\]   done clear
  B)
                  \[{{H}_{2}}{{S}_{2}}{{O}_{6}}\] done clear
  C)
                  \[{{H}_{2}}{{S}_{2}}{{O}_{8}}\]   done clear
  D)
                  \[{{H}_{2}}{{S}_{4}}{{O}_{6}}\] done clear
  View Solution play_arrow

• question_answer62)
  The following salt shows maximum covalent character [UPSEAT  2004]
  A)
                  \[AlC{{l}_{3}}\] done clear
  B)
                  \[MgC{{l}_{2}}\] done clear
  C)
                  \[CsCl\]                done clear
  D)
                  \[LaC{{l}_{3}}\] done clear
  View Solution play_arrow

• question_answer63)
  Which type of bond is present in \[{{H}_{2}}S\] molecule [MHCET 2003; Pb CET 2001]
  A)
                  Ionic bond           done clear
  B)
                  Covalent bond done clear
  C)
                  Co-ordinate        done clear
  D)
                  All of three done clear
  View Solution play_arrow

• question_answer64)
  \[{{H}_{2}}S\] is more acidic than \[{{H}_{2}}O\], due to                 [BVP  2004]
  A)
                  \[O\] is more electronegative than \[S\] done clear
  B)
                  \[O-H\] bond is stronger than \[S-H\] bond done clear
  C)
                  \[O-H\] bond is weaker than \[S-H\] bond done clear
  D)
                  None of these done clear
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• question_answer65)
  Which of the following has covalent bond [AFMC 1988; DCE 2004]
  A)
                  \[N{{a}_{2}}S\]  done clear
  B)
                  \[AlC{{l}_{3}}\] done clear
  C)
                  \[NaH\]                done clear
  D)
                  \[MgC{{l}_{2}}\] done clear
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• question_answer66)
  The following element forms a molecule with eight its own weight atoms             [MHCET 2004]
  A)
                  \[Si\]     done clear
  B)
                  \[S\] done clear
  C)
                  \[Cl\]     done clear
  D)
                  \[P\] done clear
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• question_answer67)
  In \[{{H}_{2}}{{O}_{2}}\], the two oxygen atoms have
  A)
                  Electrovalent bond          done clear
  B)
                  Covalent bond done clear
  C)
                  Coordinate bond              done clear
  D)
                  No bond done clear
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• question_answer68)
  Carbon has a valency of 2 in \[CO\] and 4 in\[C{{O}_{2}}\] and \[C{{H}_{4}}\]. Its valency in acetylene \[\left( {{C}_{2}}{{H}_{2}} \right)\] is       [NCERT 1971]
  A)
                  1              done clear
  B)
                  2 done clear
  C)
                  3              done clear
  D)
                  4 done clear
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• question_answer69)
  Number of electrons in the valence orbit of nitrogen in an ammonia molecule are            [MH CET 2004]
  A)
                  8              done clear
  B)
                  5 done clear
  C)
                  6              done clear
  D)
                  7 done clear
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• question_answer70)
  Hydrogen atoms are held together to form hydrogen molecules by                                         [AMU 1982]
  A)
                  Hydrogen bond                done clear
  B)
                  Ionic bond done clear
  C)
                  Covalent bond  done clear
  D)
                  Dative bond done clear
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• question_answer71)
  Strongest bond is                                             [AFMC 1987]
  A)
                  \[C-C\]  done clear
  B)
                  \[C-H\] done clear
  C)
                  \[C-N\] done clear
  D)
                  \[C-O\] done clear
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• question_answer72)
  The major binding force of diamond, silicon and quartz is [Kerala CET (Med.) 2002]
  A)
                  Electrostatic force            done clear
  B)
                  Electrical attraction done clear
  C)
                  Co-valent bond force     done clear
  D)
                  Non-covalent bond force done clear
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• question_answer73)
  Multiple covalent bonds exist in a molecule of   [NCERT 1973]
  A)
                  \[{{H}_{2}}\]       done clear
  B)
                  \[{{F}_{2}}\] done clear
  C)
                  \[{{C}_{2}}{{H}_{4}}\]     done clear
  D)
                  \[{{N}_{2}}\] done clear
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• question_answer74)
  Which of the following does not obey the octet rule [EAMCET 1993]
  A)
                  \[CO\]   done clear
  B)
                  \[N{{H}_{3}}\] done clear
  C)
                  \[{{H}_{2}}O\] done clear
  D)
                  \[PC{{l}_{5}}\] done clear
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• question_answer75)
  Which of the following statements is correct for covalent bond                                  [BHU 1997]
  A)
                  Electrons are shared between two atoms done clear
  B)
                  It may be polar or non-polar done clear
  C)
                  Direction is non-polar     done clear
  D)
                  Valency electrons are attracted done clear
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• question_answer76)
  Among \[Ca{{H}_{2}},N{{H}_{3}},NaH\] and \[{{B}_{2}}{{H}_{6}}\], which are covalent hydride                                    [Orissa JEE 2005]
  A)
                  \[N{{H}_{3}}\ \text{and}\ {{\text{B}}_{\text{2}}}{{H}_{6}}\]         done clear
  B)
                  \[NaH\ \text{and}\ \text{Ca}{{\text{H}}_{\text{2}}}\] done clear
  C)
                  NaH  and \[N{{H}_{3}}\]                done clear
  D)
                  \[Ca{{H}_{2}}\] and \[{{B}_{2}}{{H}_{6}}\] done clear
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