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CHEMICAL BONDING CHEMISTRY - 1C
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1. The unit of dipolemoment is
1) Einstin 2) Dalton 3)  Debye 4) Curie
2. One Debye (D) equal to
1) 1 × 10–4 esu.cm 2) 1 × 10–18 esu.cm
3) 1 × 10–10 esu.cm 4) 1 × 10–16 esu.cm
3. Carbon tetrachloride has no dipole moment
because of
1) its regular tetrahedral structure
2) Its planar structure
3) similar sizes of carbon and chlorine atoms
4) similar  electron affinities  of  carbon  and
chlorine
4. The unequal sharing of the bond pair of
electons between two atoms in a molecule
causes,
1) Dipole 2) radical formation
3) Covalent bond
4) Decomposition of molecule
5. S.I. unit for dipole moment is
1)  e.s.u-cm 2)  Coulomb-cm
3)  coulomb-metre 4) e.s.u – metre
6. Molecule with zero dipole moment is
1) BCl3 2) BeCl2
3) CCl4 4) All of these
7. Which one of the following has  = 0
1) CH2Cl2 2) SO3 3) NH3 4) H2O
8. Bent molecule having dipole moment among
the following
1) F2O 2) H2O
3) Cl2O 4) All the above
9. Which of the following molecule has zero
dipolemoment (2005)
1) BeCl2        2) HCl  3) NH3 4) H2O
10. In which of the following pairs, both
molecules possess dipole moment? (2007)
1)  2 2CO ,SO 2)  3 3BCl ,PCl
3)  2 2H O,SO 4)  2 2CO ,CS
11. Which of the following has highest dipole
moment ?
1) BF3 2) CO2 3) CCl4 4) NF3
12. Molecule with dipole moment among the
following
1) SF6 2) PCl5 3) CCl4 4) BF3
13. (A) : The dipolemoment value of NH3 is
greater than zero
(R) : In NH3 bond angle is approximately
104°
14. (A) : SiF4 is non polar even though fluorine
is much more electronegative than silicon
(R) : The four bond dipoles cancel one
another in SiF4 molecule
15. (A) : SO2 molecule has unsymmetrical shape
(R) : The dipole moment of SO2 molecule is
not equal to zero
16. The following are some statements about
dipole moment.
i) The dipolemoment of a molecule in which
the central atom has no lone–pair, is zero
ii) The dipolemoment of a diatomic molecule
having non–polar bonds is zero
iii) The dipolemoment of a diatomic molecule
having polar covalent bonds is non–zero.
1) all the three statements are correct
2) only ii is correct
3) only ii and iii are correct
4) only i and iii correct.
17. In SF6 molecule
1) bonds are polar but molecule is non polar
2) bonds are polar and molecule is also polar
3) bonds are non polar but molecule is polar
4) bonds are non polar and molecule is non polar
18. Dipolemoment is least in
1)  para – dichlorobenzene
2)  meta – dichlorobenzene
3) ortho – dichlorobenzene
4) monochloro  benzene
EXERCISE
CHEMISTRY - 1C CHEMICAL BONDING
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19. The dipole moment of HX molecule is 1.92D
and bond distance is 1.2A0. What is the
percentage ionic character of HX?
1) 33% 2) 25% 3) 70% 4) 66%
20. Which of the following will have zero dipole
moment?
1) 1, 1– dichloroethylene
2) cis-1, 2-dichloroethylene
3) trans-1, 2-dichloroethylene
4) none of these
21. The molecules BF3 and NF3 are covalent
compounds. But BF3 is non-polar and NF3
is polar. The reason is
1) Boron is a metal and nitrogen is a gas in
uncombined  state
2)  BF bonds  have no  dipole moment  where
as NF bonds have dipole moment
3) Atomic size of boron is smaller than that of
nitrogen
4) BF3 is planar but NF3 is pyramidal in shape
22. BeF2 has zero dipole moment where as H2O
has a dipole moment because
1) H2O is a linear molecule
2) H2O is a bent molecule
3) F is more electronegative than O
4) Hydrogen bonding is present in H2O
23. From the following given statements of the
order of dipolemoments.
i) HF > H2O > NH3
ii) CH2Cl2 > CHCl3>CCl4
iii)
> >
Cl
Cl
Cl
Cl
The correct combination is
1) all are correct 2) i, ii are correct
3) only iii is correct 4) only i is correct
24. A molecule MX3 has zero dipole moment.
The % of 's' character in the hybridized
orbitals of M is
1) 25% 2) 33.3% 3) 50% 4) 75%
25. Dipole moment of H2X is 1.0D. If the bond
angle is 90o, the approximate bond moment
of H-X bond is (Cos 45o= 0.7)
1) 0.4D    2) 0.5D 3) 0.7D 4) 0.6D
26. The dipolemoment of HX is 1.2D. If the ionic
character of the bond is 25%, then it's bond
length is
1) 10A0 2) 10–10m 3) 10–8m 4) 10–6m
27. Which bond angle  would result in the
maximum dipolemoment for the triatomic
molecule XY2
1)    0
90 2)    0
120
3)    0
150 4)    0
180
28. If the bond length and dipolemoment of a
diatomic molecule are 1.25Ao and 1.0D
respectively, what is the percent ionic
charcter of the bond ? (2003)
1)  10.66 2)  12.33 3)  16.66 4)  19.33
29. The highest dipolemoment is of (AFMC)
1) CF4 2) CH3OH 3) CO2 4) CH3F
30. Born - Haber cycle is used to determine
(AFMC)
1) Electron affinity 2) Lattice energy
3) Crystal lattice energy
4) All the above
31. Chemical bond implies (KCET)
1) Attraction and repulsion
2) Attraction  and  repulsion  balanced    at  a
particular  distance
3) Attraction 4) Repulsion
32. The compound having highest dipole
moment is (AIIMS)
1) 
3
3
Cl        CH
  |          |
C   =   C
  |          |
 CH    Cl
2) 
3
3
 H        CH
  |          |
C   =   C
  |          |
 CH    H
3) 
H
H
C=O 4) 
3
3
 CH    H
  |          |
C   =   C
  |          |
 CH    H
CHEMICAL BONDING CHEMISTRY - 1C
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33. The O–H bond length in H2O is xA0. The
O–H bond length in H2O2 is
1) < xA0 2) xA0 3) > xA0 4) 2x
34. The C–C bond distance is largest in
1) C2H2 2) C2H4
3) C2H2Br2 4) C2H6
35. Bond polarity is least in
1) N–H 2) O–H 3) H–F 4) C–H
36. Bond energy is highest in the molecule
1) F2            2) Br2 3) I2 4) Cl2
37. Bond energy of C–C bond is highest in
1) H3C–CH3 2) H2C=CH2
3) CH   CH 4) C2H5Cl
38. Bond energy is highest in the overlaping
1) sp3– s 2) sp2– s
3) sp – s 4) equal in all
39. Bond energy is least in the following
1) HF 2) HCl 3) HBr 4) HI
40. The highest bond energy is in
1)    
    |     |
C C
    |     |
2)    
        
N N
    |     |
3)    
 
 
       
O O
       
4) 
 
 
 
 
   
F F 
      
41. Which of the following has least bond
energy? (2000)
1) F2 2) H2 3) N2 4) O2
42. Which of the following hydrocarbon has
least C-C bond length ? (2001)
1) C2H6 2) C2H4 3) C6H6 4) C2H2
43. The correct order of bond lengths is
1) H–Cl > H–Br > H – I
2) H–I > H – Br > H – Cl
3) H–I > H–Cl > H–Br
4) H–Br > H–I > H-Cl
44. Bond energy is least in the following
1) C – C 2) N   N
3) O = O 4) F – F
45. The decreasing order of bond dissociation
energies of C–C, C–H and H–H bonds is
1)        H H C H C C                (2007)
2)         C C C H H H
3)          C H C C H H
4)         C C H H C H
46. Which of the following has largest bond
angle?
1) NO2
+ 2) NO2 3) NO2
– 4) NO3
–
47. Arrange the following in order of decreasing
N-O bond length NO2
+ , NO2
– , NO3
–
1) NO3
– > NO2
+ > NO2
–
2) NO3
– > NO2
– > NO2
+
3) NO2
+ > NO3
– > NO2
–
4) NO2
– > NO3
– > NO2
+
48. The Cl – O bond order in perchlorate ion
1) 1 2) 2 3) 1.75 4) 2.5
49. Which of the following is more stable
1)  HF       2)  HCl      3)  HBr      4)  HI
50. (A) : Dinitrogen is chemically unreactive at
ordinary temperature and is very stable
(R) : The bond dissociation energy is more
in N2 molecule (1)
51. C2H5Br + Q1  C2H5
. + Br.
C2H5Br + Q2
 C2H5
(+) + Br(–),
Then relation between Q1 & Q2 is
1) Q1 > Q2 2) Q1 < Q2
3) Q1 = Q2 4) Q1 + Q2 = 0
52. In O2, H2O2 and O3, the correct order of
'oxygen–oxygen' bond length is
1) O2 > O3 > H2O2 2) O3 > H2O2 > O2
3) H2O2 > O3 > O2 4) O2 > H2O2 > O3
53. Bond length of H2 is 0.074nm, Bond length
of Cl2 is 1.98A0. Bond length of HCl is
1)  2.72Ao 2)  136pm
3)  1.027nm 4)  0.136Ao
CHEMISTRY - 1C CHEMICAL BONDING
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54. Energy required to dissociate 4gm of
gaseous hydrogen in to free gaseous atoms
is 208Kcal at 250C.The bond energy of H–
H would be
1) 54 Kcal/mol 2) 104 Kcal/mol
3) 208 Kcal/mol 4) 20.8 Kcal/mol
55. Average C–H bond energy is 416 kJ.mol–1.
Which of the following is correct? (2004)
1) CH4(g) + 416 kJ   C(g) + 4H(g)
2) CH4(g)  C(g) + 4H(g) + 416 kJ
3) CH4(g) + 1664 kJ   C(g) + 4H(g)
4) CH4(g)  C(g) + 4H(g) + 1664 kJ
56. The resonance hybrid of nitrate ion is
1)  2) 
3)  4) 
57. The bond dissociation of the molecules A2,
B2, C2 are 498, 158, 945 KJ/ mole
respectively. If so, the correct decreasing
order of their bond orders is
1) A2, B2, C2 2) C2, B2, A2
3) C2, A2, B2 4) B2, C2, A2
58. The table shown lists the bond dissociation
energies (Ediss) for single covalent bonds
formed between carbon and atoms of
elements A,B,C and D. Which element has
the smallest atom.
Bond between C Ediss (KJmole-1)
and other atom
A) C –A 240
B) C – B 328
C) C – C 276
D) C – D 485
1) C 2) D 3) A 4) B
59. The correct order of N -O bond length in
NO, NO–
2 , NO–
3 and N2O4 will be (BHU)
1) NO > N2O4 > NO2 > NO3
–
2) NO > NO–
3 > N2O4 > NO–
2
3) NO3
– > NO2
– > N2O4 > NO
4) N2O4 > NO2
– > NO3
– > NO
60. Which of the following has lowest melting
point? (CPMT)
1) Argon 2) NaCl 3) Iron 4) Silicon
61. The C–H bond distance is largest in
1) C2H2 2) C2H4 (MLNR)
3) C6H6 4) C2H4Br2
62. In compounds of type ECl3, where E = B, P.
As or Bi, the angles Cl - E - Cl for different
E are in the order (BHU)
1) B > P = As = Bi 2) B > P > As > Bi
3) B < P = As = Bi 4) B < P < As < Bi
63. The geometry of H2S and its dipole moment
are (AFMC)
1) Angular and non-zero
2) Angular and zero
3) Linear and non-zero
4) Linear and zero
64. The correct order of increasing C-O bond
length of CO, CO 2
3 and CO2 (IIT)
1) CO 2
3 < CO2 < CO 2) CO2 < CO 2
3 < CO
3) CO < CO 2
3 < CO2 4) CO < CO2 < CO 2
3
65. The number and type of bonds between two
carbon atoms in CaC2 are (IIT)
1) One sigma ( ) and one pi (  ) bonds
2) One sigma ( ) and two pi (  ) bonds
3) One sigma ( ) and a half pi (  ) bonds
4) One sigma ( ) bond only
66. KF combines with HF to form KHF2. The
compound contains the species (IIT)
1) K+, F– and H+ 2) K+, F– and HF
3) K+ and [HF2]–1 4) [KHF]+ and F–
CHEMICAL BONDING CHEMISTRY - 1C
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67. The bond order of individual C–C bond in
benzene is (IIT)
1) One  2) Two
3) Between one and two 4) None of these
68. In which of the following species the inter
atomic bond angle is 1090.28! (AIEEE)
1) NH3 (BF3) 2) (NH4)+ (BF3)
3) NH3 (BF4)– 4) (NH2)– (BF3)
69. Which one of the following pairs of
molecules will have permanent dipole-
moments for both members? (AIEEE)
1) SiF4 and CO2 2) SiF4 and NO2
3) NO2 and CO2 4) NO2 and O3
70. Which of the following compounds has the
smallest bond angle in its molecule (AIEEE)
1) NH3 2) SO2 3) OH2 4) SH2
PASSAGE TYPE QUESTIONS
PASSAGE - I : T Sodium chloride crystallises into
F.C.C lattice with Na+ occupying corner of a cube
and the centre of each face, where as Cl– is occupy
the  centre of  each edge  and centre  of  the  cube.
The rc/ra value for NaCl is 0.53 and coordination
number is 6,6.
1. If all the ions present in one plane that is
passing through the centre are removed, the
formula of the resulting unit cell is
1) NaCl 2) Na2Cl3 3) Na3Cl2 4) NaCl2
2. If all the face centred ions along one of the
axis are removed. The stoichiometry of the
resulting solid is
1) NaCl2 2) Na2Cl 3) Na4Cl3 4) Na3Cl4
3. In NaCl crystal lattice each sodium ion is
surrounded by ––– number of chloride ions
in –---––– fashion
1) 8, tetrahedral 2) 6, octahedral
3) 8, square planar
4) 6, distorted octahedron
4. In NaCl unit cell, the edge length is
1) 2rc+ 2ra 2) rc+ra
3) 
2
c ar r
4)   3 c ar r
PASSAGE - II : According to V.B.T. a covalent
bond is formed by  the overlapping of half  filled
atomic  orbitals  with  electron  spinning  in  the
opposite direction. The strength of a bond depends
on extent of overlapping. Double bond energy  is
not twice  that  of  single  bond  energy  because  a
double bond  is made up of a weak    bond and
strong   bond.
5. According to V.B.T, in the formation of CH4
molecule the type of overlappings observed
are
1) p–s, s–s 2) p – s
3) sp3 – s, s–s 4) sp2 – s, s – s
6. The expected bond angle in NH3 molecule
according to V.B.T is
1) 900 2) 1070
3) 1090.28' 4) 1200
7. More energy is required to break the bond
between the carbon atoms in
1) C2H6 2) C2H4
3) C6H6 4) C2H2
8. Bond energy is highest in
1) F2 2) Cl2 3) O2 4) N2
PASSAGE - III : Hydrogen  bond  is  a  weak
electrostatic force of attraction between covalently
bonded hydrogen and more electronegative species
like  F,O  and  N.  It  play  an  important  role  in
influencing many physical constants. It is a weaker
bond  than  covalent  bond  but  stronger  than
vanderwaal forces of attraction.
9. Hydrogen bonding is absent in
1) CH3OH 2) CH3F
3) CH3NH2 4) (CH3)2NH
10. Chelation is observed in
1) P - nitrophenol 2) O - nitrophenol
3)  Benzaldehyde 4) HF
CHEMISTRY - 1C CHEMICAL BONDING
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11. During the boiling of a liquid, the bonds
broken are
1)  Intramolecular Hydrogen  bonding
2)  Intermolecular Hydrogen  bonding
3) Covalent bond
4) Dative bond
12. Which of the following can exsist as a
Hexamer in vapour state
1) H2O 2) HF
3) CH3CHO 4) C2H5OH
PASSAGE - IV: The  geometry  of  a  molecule
depends upon the repulsions between electron pair
present in the valance shell of the central atom. LP
– LP repulsions are greater than LP–BP which are
greater than BP – BP. A pi bond can not decide the
geometry of  a molecule  because pi  bond has  no
independent exsistance. Deviations in bond angle
is due to the presence of lone pairs.
13. Which of the following differ from the rest
in geometry.
1) BF3 2) SO3 3) SO3
2– 4) CO3
2–
14. In which of the following orientation of
electron pairs around the central atom is
tetrahedral
1) NH3 2) CH3
–
3) CH3
+ 4) Both NH3 and CH3
–
15. Which of the following molecule is linear in
shape.
1) I3
– 2) CO2
3) Both  I3
– and CO2 4) SO2
16. Square planar species among the following
is
1) XeF4 2) NiCl4
2–
3) Both XeF4 and NiCl4
2– 4) CH4
ANSWERS
1) 3 2) 2 3) 1 4) 1 5) 3
6) 4 7) 2 8) 4 9) 1 10) 3
11) 4 12) 2 13) 3 14) 1 15) 1
16) 3 17) 1 18) 1 19) 1 20) 3
21) 4 22) 2 23) 2 24) 2 25) 3
26) 2 27) 1 28) 3 29) 2 30) 4
31) 2 32) 3 33) 2 34) 4 35) 4
36) 4 37) 3 38) 3 39) 4 40) 1
41) 1 42) 4 43) 2 44) 4 45) 1
46) 1 47) 2 48) 3 49) 1 50) 1
51) 2 52) 3 53) 2 54) 2 55) 3
56) 3 57) 3 58) 2 59) 3 60) 1
61) 4 62) 2 63) 1 64) 4 65) 2
66) 3 67) 3 68) 1 69) 4 70) 4
PASSAGES
1) 1 2) 4 3) 2 4) 1 5) 1
6) 1 7) 4 8) 4 9) 2 10) 2
11) 2 12) 2 13) 3 14) 4 15) 2
16) 1
ANSWERS
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Chemical bonding

  • 1. CHEMICAL BONDING CHEMISTRY - 1C WWW.SCIENCE360.NET 1. The unit of dipolemoment is 1) Einstin 2) Dalton 3)  Debye 4) Curie 2. One Debye (D) equal to 1) 1 × 10–4 esu.cm 2) 1 × 10–18 esu.cm 3) 1 × 10–10 esu.cm 4) 1 × 10–16 esu.cm 3. Carbon tetrachloride has no dipole moment because of 1) its regular tetrahedral structure 2) Its planar structure 3) similar sizes of carbon and chlorine atoms 4) similar  electron affinities  of  carbon  and chlorine 4. The unequal sharing of the bond pair of electons between two atoms in a molecule causes, 1) Dipole 2) radical formation 3) Covalent bond 4) Decomposition of molecule 5. S.I. unit for dipole moment is 1)  e.s.u-cm 2)  Coulomb-cm 3)  coulomb-metre 4) e.s.u – metre 6. Molecule with zero dipole moment is 1) BCl3 2) BeCl2 3) CCl4 4) All of these 7. Which one of the following has  = 0 1) CH2Cl2 2) SO3 3) NH3 4) H2O 8. Bent molecule having dipole moment among the following 1) F2O 2) H2O 3) Cl2O 4) All the above 9. Which of the following molecule has zero dipolemoment (2005) 1) BeCl2        2) HCl  3) NH3 4) H2O 10. In which of the following pairs, both molecules possess dipole moment? (2007) 1)  2 2CO ,SO 2)  3 3BCl ,PCl 3)  2 2H O,SO 4)  2 2CO ,CS 11. Which of the following has highest dipole moment ? 1) BF3 2) CO2 3) CCl4 4) NF3 12. Molecule with dipole moment among the following 1) SF6 2) PCl5 3) CCl4 4) BF3 13. (A) : The dipolemoment value of NH3 is greater than zero (R) : In NH3 bond angle is approximately 104° 14. (A) : SiF4 is non polar even though fluorine is much more electronegative than silicon (R) : The four bond dipoles cancel one another in SiF4 molecule 15. (A) : SO2 molecule has unsymmetrical shape (R) : The dipole moment of SO2 molecule is not equal to zero 16. The following are some statements about dipole moment. i) The dipolemoment of a molecule in which the central atom has no lone–pair, is zero ii) The dipolemoment of a diatomic molecule having non–polar bonds is zero iii) The dipolemoment of a diatomic molecule having polar covalent bonds is non–zero. 1) all the three statements are correct 2) only ii is correct 3) only ii and iii are correct 4) only i and iii correct. 17. In SF6 molecule 1) bonds are polar but molecule is non polar 2) bonds are polar and molecule is also polar 3) bonds are non polar but molecule is polar 4) bonds are non polar and molecule is non polar 18. Dipolemoment is least in 1)  para – dichlorobenzene 2)  meta – dichlorobenzene 3) ortho – dichlorobenzene 4) monochloro  benzene EXERCISE
  • 2. CHEMISTRY - 1C CHEMICAL BONDING WWW.SCIENCE360.NET 19. The dipole moment of HX molecule is 1.92D and bond distance is 1.2A0. What is the percentage ionic character of HX? 1) 33% 2) 25% 3) 70% 4) 66% 20. Which of the following will have zero dipole moment? 1) 1, 1– dichloroethylene 2) cis-1, 2-dichloroethylene 3) trans-1, 2-dichloroethylene 4) none of these 21. The molecules BF3 and NF3 are covalent compounds. But BF3 is non-polar and NF3 is polar. The reason is 1) Boron is a metal and nitrogen is a gas in uncombined  state 2)  BF bonds  have no  dipole moment  where as NF bonds have dipole moment 3) Atomic size of boron is smaller than that of nitrogen 4) BF3 is planar but NF3 is pyramidal in shape 22. BeF2 has zero dipole moment where as H2O has a dipole moment because 1) H2O is a linear molecule 2) H2O is a bent molecule 3) F is more electronegative than O 4) Hydrogen bonding is present in H2O 23. From the following given statements of the order of dipolemoments. i) HF > H2O > NH3 ii) CH2Cl2 > CHCl3>CCl4 iii) > > Cl Cl Cl Cl The correct combination is 1) all are correct 2) i, ii are correct 3) only iii is correct 4) only i is correct 24. A molecule MX3 has zero dipole moment. The % of 's' character in the hybridized orbitals of M is 1) 25% 2) 33.3% 3) 50% 4) 75% 25. Dipole moment of H2X is 1.0D. If the bond angle is 90o, the approximate bond moment of H-X bond is (Cos 45o= 0.7) 1) 0.4D    2) 0.5D 3) 0.7D 4) 0.6D 26. The dipolemoment of HX is 1.2D. If the ionic character of the bond is 25%, then it's bond length is 1) 10A0 2) 10–10m 3) 10–8m 4) 10–6m 27. Which bond angle  would result in the maximum dipolemoment for the triatomic molecule XY2 1)    0 90 2)    0 120 3)    0 150 4)    0 180 28. If the bond length and dipolemoment of a diatomic molecule are 1.25Ao and 1.0D respectively, what is the percent ionic charcter of the bond ? (2003) 1)  10.66 2)  12.33 3)  16.66 4)  19.33 29. The highest dipolemoment is of (AFMC) 1) CF4 2) CH3OH 3) CO2 4) CH3F 30. Born - Haber cycle is used to determine (AFMC) 1) Electron affinity 2) Lattice energy 3) Crystal lattice energy 4) All the above 31. Chemical bond implies (KCET) 1) Attraction and repulsion 2) Attraction  and  repulsion  balanced    at  a particular  distance 3) Attraction 4) Repulsion 32. The compound having highest dipole moment is (AIIMS) 1)  3 3 Cl        CH   |          | C   =   C   |          |  CH    Cl 2)  3 3  H        CH   |          | C   =   C   |          |  CH    H 3)  H H C=O 4)  3 3  CH    H   |          | C   =   C   |          |  CH    H
  • 3. CHEMICAL BONDING CHEMISTRY - 1C WWW.SCIENCE360.NET 33. The O–H bond length in H2O is xA0. The O–H bond length in H2O2 is 1) < xA0 2) xA0 3) > xA0 4) 2x 34. The C–C bond distance is largest in 1) C2H2 2) C2H4 3) C2H2Br2 4) C2H6 35. Bond polarity is least in 1) N–H 2) O–H 3) H–F 4) C–H 36. Bond energy is highest in the molecule 1) F2            2) Br2 3) I2 4) Cl2 37. Bond energy of C–C bond is highest in 1) H3C–CH3 2) H2C=CH2 3) CH   CH 4) C2H5Cl 38. Bond energy is highest in the overlaping 1) sp3– s 2) sp2– s 3) sp – s 4) equal in all 39. Bond energy is least in the following 1) HF 2) HCl 3) HBr 4) HI 40. The highest bond energy is in 1)         |     | C C     |     | 2)              N N     |     | 3)                 O O         4)              F F         41. Which of the following has least bond energy? (2000) 1) F2 2) H2 3) N2 4) O2 42. Which of the following hydrocarbon has least C-C bond length ? (2001) 1) C2H6 2) C2H4 3) C6H6 4) C2H2 43. The correct order of bond lengths is 1) H–Cl > H–Br > H – I 2) H–I > H – Br > H – Cl 3) H–I > H–Cl > H–Br 4) H–Br > H–I > H-Cl 44. Bond energy is least in the following 1) C – C 2) N   N 3) O = O 4) F – F 45. The decreasing order of bond dissociation energies of C–C, C–H and H–H bonds is 1)        H H C H C C                (2007) 2)         C C C H H H 3)          C H C C H H 4)         C C H H C H 46. Which of the following has largest bond angle? 1) NO2 + 2) NO2 3) NO2 – 4) NO3 – 47. Arrange the following in order of decreasing N-O bond length NO2 + , NO2 – , NO3 – 1) NO3 – > NO2 + > NO2 – 2) NO3 – > NO2 – > NO2 + 3) NO2 + > NO3 – > NO2 – 4) NO2 – > NO3 – > NO2 + 48. The Cl – O bond order in perchlorate ion 1) 1 2) 2 3) 1.75 4) 2.5 49. Which of the following is more stable 1)  HF       2)  HCl      3)  HBr      4)  HI 50. (A) : Dinitrogen is chemically unreactive at ordinary temperature and is very stable (R) : The bond dissociation energy is more in N2 molecule (1) 51. C2H5Br + Q1  C2H5 . + Br. C2H5Br + Q2  C2H5 (+) + Br(–), Then relation between Q1 & Q2 is 1) Q1 > Q2 2) Q1 < Q2 3) Q1 = Q2 4) Q1 + Q2 = 0 52. In O2, H2O2 and O3, the correct order of 'oxygen–oxygen' bond length is 1) O2 > O3 > H2O2 2) O3 > H2O2 > O2 3) H2O2 > O3 > O2 4) O2 > H2O2 > O3 53. Bond length of H2 is 0.074nm, Bond length of Cl2 is 1.98A0. Bond length of HCl is 1)  2.72Ao 2)  136pm 3)  1.027nm 4)  0.136Ao
  • 4. CHEMISTRY - 1C CHEMICAL BONDING WWW.SCIENCE360.NET 54. Energy required to dissociate 4gm of gaseous hydrogen in to free gaseous atoms is 208Kcal at 250C.The bond energy of H– H would be 1) 54 Kcal/mol 2) 104 Kcal/mol 3) 208 Kcal/mol 4) 20.8 Kcal/mol 55. Average C–H bond energy is 416 kJ.mol–1. Which of the following is correct? (2004) 1) CH4(g) + 416 kJ   C(g) + 4H(g) 2) CH4(g)  C(g) + 4H(g) + 416 kJ 3) CH4(g) + 1664 kJ   C(g) + 4H(g) 4) CH4(g)  C(g) + 4H(g) + 1664 kJ 56. The resonance hybrid of nitrate ion is 1)  2)  3)  4)  57. The bond dissociation of the molecules A2, B2, C2 are 498, 158, 945 KJ/ mole respectively. If so, the correct decreasing order of their bond orders is 1) A2, B2, C2 2) C2, B2, A2 3) C2, A2, B2 4) B2, C2, A2 58. The table shown lists the bond dissociation energies (Ediss) for single covalent bonds formed between carbon and atoms of elements A,B,C and D. Which element has the smallest atom. Bond between C Ediss (KJmole-1) and other atom A) C –A 240 B) C – B 328 C) C – C 276 D) C – D 485 1) C 2) D 3) A 4) B 59. The correct order of N -O bond length in NO, NO– 2 , NO– 3 and N2O4 will be (BHU) 1) NO > N2O4 > NO2 > NO3 – 2) NO > NO– 3 > N2O4 > NO– 2 3) NO3 – > NO2 – > N2O4 > NO 4) N2O4 > NO2 – > NO3 – > NO 60. Which of the following has lowest melting point? (CPMT) 1) Argon 2) NaCl 3) Iron 4) Silicon 61. The C–H bond distance is largest in 1) C2H2 2) C2H4 (MLNR) 3) C6H6 4) C2H4Br2 62. In compounds of type ECl3, where E = B, P. As or Bi, the angles Cl - E - Cl for different E are in the order (BHU) 1) B > P = As = Bi 2) B > P > As > Bi 3) B < P = As = Bi 4) B < P < As < Bi 63. The geometry of H2S and its dipole moment are (AFMC) 1) Angular and non-zero 2) Angular and zero 3) Linear and non-zero 4) Linear and zero 64. The correct order of increasing C-O bond length of CO, CO 2 3 and CO2 (IIT) 1) CO 2 3 < CO2 < CO 2) CO2 < CO 2 3 < CO 3) CO < CO 2 3 < CO2 4) CO < CO2 < CO 2 3 65. The number and type of bonds between two carbon atoms in CaC2 are (IIT) 1) One sigma ( ) and one pi (  ) bonds 2) One sigma ( ) and two pi (  ) bonds 3) One sigma ( ) and a half pi (  ) bonds 4) One sigma ( ) bond only 66. KF combines with HF to form KHF2. The compound contains the species (IIT) 1) K+, F– and H+ 2) K+, F– and HF 3) K+ and [HF2]–1 4) [KHF]+ and F–
  • 5. CHEMICAL BONDING CHEMISTRY - 1C WWW.SCIENCE360.NET 67. The bond order of individual C–C bond in benzene is (IIT) 1) One  2) Two 3) Between one and two 4) None of these 68. In which of the following species the inter atomic bond angle is 1090.28! (AIEEE) 1) NH3 (BF3) 2) (NH4)+ (BF3) 3) NH3 (BF4)– 4) (NH2)– (BF3) 69. Which one of the following pairs of molecules will have permanent dipole- moments for both members? (AIEEE) 1) SiF4 and CO2 2) SiF4 and NO2 3) NO2 and CO2 4) NO2 and O3 70. Which of the following compounds has the smallest bond angle in its molecule (AIEEE) 1) NH3 2) SO2 3) OH2 4) SH2 PASSAGE TYPE QUESTIONS PASSAGE - I : T Sodium chloride crystallises into F.C.C lattice with Na+ occupying corner of a cube and the centre of each face, where as Cl– is occupy the  centre of  each edge  and centre  of  the  cube. The rc/ra value for NaCl is 0.53 and coordination number is 6,6. 1. If all the ions present in one plane that is passing through the centre are removed, the formula of the resulting unit cell is 1) NaCl 2) Na2Cl3 3) Na3Cl2 4) NaCl2 2. If all the face centred ions along one of the axis are removed. The stoichiometry of the resulting solid is 1) NaCl2 2) Na2Cl 3) Na4Cl3 4) Na3Cl4 3. In NaCl crystal lattice each sodium ion is surrounded by ––– number of chloride ions in –---––– fashion 1) 8, tetrahedral 2) 6, octahedral 3) 8, square planar 4) 6, distorted octahedron 4. In NaCl unit cell, the edge length is 1) 2rc+ 2ra 2) rc+ra 3)  2 c ar r 4)   3 c ar r PASSAGE - II : According to V.B.T. a covalent bond is formed by  the overlapping of half  filled atomic  orbitals  with  electron  spinning  in  the opposite direction. The strength of a bond depends on extent of overlapping. Double bond energy  is not twice  that  of  single  bond  energy  because  a double bond  is made up of a weak    bond and strong   bond. 5. According to V.B.T, in the formation of CH4 molecule the type of overlappings observed are 1) p–s, s–s 2) p – s 3) sp3 – s, s–s 4) sp2 – s, s – s 6. The expected bond angle in NH3 molecule according to V.B.T is 1) 900 2) 1070 3) 1090.28' 4) 1200 7. More energy is required to break the bond between the carbon atoms in 1) C2H6 2) C2H4 3) C6H6 4) C2H2 8. Bond energy is highest in 1) F2 2) Cl2 3) O2 4) N2 PASSAGE - III : Hydrogen  bond  is  a  weak electrostatic force of attraction between covalently bonded hydrogen and more electronegative species like  F,O  and  N.  It  play  an  important  role  in influencing many physical constants. It is a weaker bond  than  covalent  bond  but  stronger  than vanderwaal forces of attraction. 9. Hydrogen bonding is absent in 1) CH3OH 2) CH3F 3) CH3NH2 4) (CH3)2NH 10. Chelation is observed in 1) P - nitrophenol 2) O - nitrophenol 3)  Benzaldehyde 4) HF
  • 6. CHEMISTRY - 1C CHEMICAL BONDING WWW.SCIENCE360.NET 11. During the boiling of a liquid, the bonds broken are 1)  Intramolecular Hydrogen  bonding 2)  Intermolecular Hydrogen  bonding 3) Covalent bond 4) Dative bond 12. Which of the following can exsist as a Hexamer in vapour state 1) H2O 2) HF 3) CH3CHO 4) C2H5OH PASSAGE - IV: The  geometry  of  a  molecule depends upon the repulsions between electron pair present in the valance shell of the central atom. LP – LP repulsions are greater than LP–BP which are greater than BP – BP. A pi bond can not decide the geometry of  a molecule  because pi  bond has  no independent exsistance. Deviations in bond angle is due to the presence of lone pairs. 13. Which of the following differ from the rest in geometry. 1) BF3 2) SO3 3) SO3 2– 4) CO3 2– 14. In which of the following orientation of electron pairs around the central atom is tetrahedral 1) NH3 2) CH3 – 3) CH3 + 4) Both NH3 and CH3 – 15. Which of the following molecule is linear in shape. 1) I3 – 2) CO2 3) Both  I3 – and CO2 4) SO2 16. Square planar species among the following is 1) XeF4 2) NiCl4 2– 3) Both XeF4 and NiCl4 2– 4) CH4 ANSWERS 1) 3 2) 2 3) 1 4) 1 5) 3 6) 4 7) 2 8) 4 9) 1 10) 3 11) 4 12) 2 13) 3 14) 1 15) 1 16) 3 17) 1 18) 1 19) 1 20) 3 21) 4 22) 2 23) 2 24) 2 25) 3 26) 2 27) 1 28) 3 29) 2 30) 4 31) 2 32) 3 33) 2 34) 4 35) 4 36) 4 37) 3 38) 3 39) 4 40) 1 41) 1 42) 4 43) 2 44) 4 45) 1 46) 1 47) 2 48) 3 49) 1 50) 1 51) 2 52) 3 53) 2 54) 2 55) 3 56) 3 57) 3 58) 2 59) 3 60) 1 61) 4 62) 2 63) 1 64) 4 65) 2 66) 3 67) 3 68) 1 69) 4 70) 4 PASSAGES 1) 1 2) 4 3) 2 4) 1 5) 1 6) 1 7) 4 8) 4 9) 2 10) 2 11) 2 12) 2 13) 3 14) 4 15) 2 16) 1 ANSWERS jjjjj