1. In which of the following ionic, covalent and coordinate bonds are present
[UPSEAT 2002]
(a) Water
(b) Ammonia
(c) Sodium cyanide
(d) Potassium bromide
2. The bonds in [K4Fe(CN)6] are
[EAMCET 1991]
(a) All ionic
(b) All covalent
(c) Ionic and covalent
(d) Ionic, covalent and coordinate covalent
3. Hydrogen bonding is not present in
[AIIMS 1998; MP PET/PMT 1998]
(a) Glycerine
(b) Water
(c) Hydrogen sulphide
(d) Hydrogen fluoride
4. The maximum number of hydrogen bonds formed by a water molecule in ice is
[MP PET 1993; AFMC 2002;UPSEAT 1999, 2001, 02]
(a) 4 (b) 3
(c) 2 (d) 1
5. In the process O+2 → O+22 + e the electron lost is from
[Orissa JEE 2002]
(a) Bonding -orbital (b) Antibonding -orbital
(c)2pz orbital (d)2px orbital
6. What bond order does O-22 have
[Pb. PMT 2001]
(a) 3
(b) 2
(c) 1
(d) 1/2
7. Which of the following halogens has the highest bond energy
[CPMT 1988]
(a)F2
(b)Cl2
(c)Br2
(d)I2
8. The geometry of ClO3- according to valence shell electron pair repulsion (VSEPR) theory will be
[KCET 1996; MP PET 1997]
(a) Planar triangle
(b) Pyramidal
(c) Tetrahedral
(d) Square planar
9. The molecule having one unpaired electron is
[IIT 1985; MP PMT 1989]
(a) NO (b) CO
(c) CN- (d) O2
10. The hybridization of atomic orbitals of nitrogen in NO+2, NO- 3 and NH+4 are
[IIT Screening 2000]
(a) sp, sp3 and sp2 respectively
(b) sp, sp2 and sp3 respectively
(c) sp2, sp and sp3 respectively
(d) sp2, sp3 and sp respectively
11. Which of the following resonating structures of N2O is the most contributing
[Roorkee Qualifying 1998]
(a) N ≡ N − O
(b) N − N ≡ O
(c) N = N − O
(d) N − N = O
12. The number and type of bonds between two carbon atoms in CaC2 are
[IIT 1996]
(a) One sigma (σ) and one pi (π) bonds
(b) One sigma (σ) and two pi (π) bonds
(c) One sigma (σ) and one and a half pi (π) bonds
(d) One sigma (σ) bond
13. The hybridization in sulphur dioxide is
[IIT 1986; DPMT 1990]
(a) sp
(b) sp3
(c) sp2
(d) dsp2
14. The shape of H3O+ ion is
[EAMCET 1993; CPMT 2001]
(a) Linear
(b) Angular
(c) Trigonal planar
(d) Triangular pyramidal
15. How many σ and π bonds are there in the molecule of tetracyanoethylene
[NCERT 1980; MP PMT 1986, 95;Orissa JEE 1997]
(a) Nine σ and nine π
(b) Five σ and nine π
(c) Nine σ and seven π
(d) Five σ and eight π
16. The geometry of H2S and its dipole moment is
[IIT 1999]
(a) Angular and non-zero
(b) Angular and zero
(c) Linear and non-zero
(d) Linear and zero
17. Which of the following bond has the most polar character
[DPMT 1982; CBSE PMT 1992; CPMT 1999]
(a)C − O
(b)C − Br
(c)C − S
(d)C − F
18. The electronegativity of C, H, O, N, and S are 2.5, 2.1, 3.5,3.0, and 2.5 respectively. Which of the following bond is most polar [EAMCET 1986]
(a) O − H
(b) S − H
(c) N − H
(d) C − H
19. The order of dipole moments of the following molecules is
[Roorkee 2000]
(a) CHCl3 > CH2Cl2 > CH3Cl > CCl4
(b) CH2Cl2 > CH3Cl > CHCl3 > CCl4
(c) CH3Cl > CH2Cl2 > CHCl3 > CCl4
(d) CH2Cl2 > CHCl3 > CH3Cl > CCl4
20. Polarization of electrons in acrolein may be written as
[IIT 1988]
(a) σ-CH2 = CH − σ+CH =O
(b) σ-CH2 = CH - CH = σ+O
(c) σ-C H2 = σ+CH − CH = O
(d) σ+CH2 = CH - CH = σ-O
21. The dipole moment of chlorobenzene is 1.73 D. The dipole moment of p - dichlorobenzene is expected to be
[CPMT 1991]
(a) 3.46 D
(b) 0.00 D
(c) 1.73 D
(d) 1.00 D
22. Co-ordinate bond is absent in
[RPMT 2002]
(a) BH-4
(b) CO-23
(c) H 3O+
(d) NH+3
23. Which one of the following molecules has a coordinate bond
[CPMT 1988, 94]
(a) NH4Cl
(b) AlCl3
(c) NaCl
(d) Cl2
24. Sodium chloride is an ionic compound whereas hydrogen chloride is a gas because
[KCET 2002]
(a) Sodium is reactive
(b) Covalent bond is weaker than ionic bond
(c) Hydrogen chloride is a gas
(d) Covalent bond is stronger than ionic bond
25. The octet rule is not followed in
[BHU 1981]
(a) F2
(b) NaF
(c) CaF2
(d) BF3
26. In which of the following reactions, there is no change in the valency
[NCERT 1974; CPMT 1971, 78]
(a) 4KClO3 → 3KClO4 + KCl
(b) SO2 + 2H2S →2H2O + 3S
(c) BaO2 + H2SO4 →BaSO4 + H2O2
(d) 2BaO + O2 →2BaO2
27. The solution of sugar in water contains
[NCERT 1972; MP PET 2000]
(a) Free atoms
(b) Free molecules
(c) Free ions
(d) Free atoms and free molecules
28. Which one in the following contains ionic as well as
covalent bond
[IIT 1979; CPMT 1983; DPMT 1983]
(a) CH4 (b) H2
(c) KCN (d) KCl
29. From the following which compound on heating readily sublimes
(a) NaCl
(b) MgCl2
(c) BaCl2
(d) AlCl3
30. Electricity do not pass through ionic compounds
(a) In solution
(b) In solid-state
(c) In melted state
(d) None of these
31. Two elements X and Y have the following electronic configuration = 1s2, 2s2 2p6, 3s2 3p6, 4s2 and Y = 1s2, 2s2 2p6, 3s2 3p5 . The expected compound formed by combination of X and Y is
[BHU 1990]
(a) XY2
(b) X5Y2
(c) X2Y5
(d) XY5
32. Nature of the bond formed between two elements depends
on the
(a) Oxidation potential
(b) Electronegativity
(c) Ionization potential
(d) Electron affinity
Answers:
1. (c) Sodium cyanide contain ionic, covalent and coordinate
bond.
2. (d) Structure of [K4Fe(CN)6] is
3. (c) Hydrogen bonding is present in molecules which have
F, O, or N atoms.
4. (a) In ice each water molecule forms four hydrogen bond through which each water molecule is tetrahedrally attached with other water molecules.
5. (b) Electron lost from antibonding orbital.
6. (c) O-22 have bond order one B.O. = ½ [10 - 8] = 2/2 = 1
7. (b) Bond energy of Cl2 is highest among all halogen molecule. Bond energies of F2 , Cl2 , Br2 , I2 are 37, 58, 46 and 36 K cal mol-1 respectively.
8.
.
9. (a) NO has one unpaired electron with Nitrogen.
10. (b) The shape of NO+2, NO-3 and NH+4 are linear trigonal planar and tetrahedral respectively. Thus the hybridization of atomic orbitals of nitrogen in these species are sp, sp2 and sp3 respectively.
11. (a) In N2O molecule N ≡ N − O structure is most contributed.
12. (b) In two carbons are joined with 1 σ and 2 π bonds.
13. (c) SO2 molecule has sp2 hybridization.
14. (d) H3O+ has sp3 hybridization and its shape is triangular pyramidal due to lone pair on oxygen.
15. (d)
9 π and 9 σ bonds.
16. (a) H2S has angular geometry and have some value of dipole moment.
17. (d) C − F bond has the most polar character due to the difference of their electronegativity.
18. (a) More the difference in electronegativity of atoms. Bond between them will be more polar.
19. (d) CCl4 has zero dipole moment because of the symmetric tetrahedral structure. CH3Cl has a slightly higher dipole moment which is equal to 1.86D. Now, CH3Cl has less electronegativity then CH2Cl2. But CH2Cl2 has greater dipole moment than CHCl3
20. (d)
21. (b) Due to symmetry dipole moment of p-dichlorobenzene is zero.
22. (b) 
23. (a) NH4Cl has a coordinate bond besides covalent and ionic bonds
24. (b) NaCl is an ionic compound because it consists of more electronegativity difference compare to HCl.
25. (d) BF3 does not have an octet, it has only six electrons so it is an electron-deficient compound.
26. (c) In the reaction valency is not changing.
27. (b) Sugar is an organic compound which is covalently bonded so in water it remains as free molecules.
28. (c) Structure of KCN is [K+(C- ≡ N )
29. (d) AlCl3 sublimes readily on heating.
30. (b) Ionic compounds can’t pass electricity in solid state because they don’t have mobile ion in solid state.
31. (a) From electronic configuration valencies of X and Y are + 2 and –1 respectively so formula of compound is XY2
32. (b) If the two elements have similar electronegativities, the bond between them will be covalent, while a large difference in electronegativities leads to an ionic bond.
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