Chemical Bonding - Multiple Choice Questions

1. The ion that isoelectronic with CO is

a. CN^-
b. O2⁺
c. O2^-
d. N2⁺
(JEE 1982)

ans: (a)

isoelectronic means same number of electrons

2. carbon tetrachloride has no net dipole moment because of

a. its planar structure
b. its regular tetrahedral structure
c. similar sizes of carbon and chlorine atoms
d. similar electron affinities of carbon and chlorine
(JEE 1983)

ans (b)

3. which one among the following does not have the hydrogen bond?

a. phenol
b. liquid NH3
c. water
d. liquid HCl
(JEE 1983)

Ans: (d)

4. the types of bonds present in CuSO4.5H2O are only

a. electrovalent and covalent
b. electrovalent and coordinate covalent
c. electrovalent, covalent and coordinate covalent
d. covalent and coordinate covalent

5. On hybridization of one s and one p orbitals we get:

a.two mutually perpendicular orbitals
b. two orbital at 180°
c. four orbitals directed tetrahedrally
d. three orbital in a plane
(JEE 1984)

Answer: (b)

6. the molecule having one unpaired electron is:

a. NO
b. CO
c. CN^-
d. O2
(JEE 1985)

Ans: (a)

7. The bond between two identical non-metal atoms has a pair of electrons:

a. unequally shared between the two.
b.transferred fully from one atom to another
c. with identical spins
d. equally shared between them
(JEE 1986)

Ans: (d)

8. the hydrogen bond is strongest in:

a. O-H…S
b. S-H…O
c. F-H…S
d. F-H...O
(JEE 1986)

Answer: ( c )

9. The hybridization of sulphur dioxide is:

a. sp
b. sp²
c. dsp²
d. sp³
(JEE 1986)

answer (b)

10. The bonds present in N2O5 are ______

a. only ionic
b. covalent and coordinate
c. only covalent
d. covalent and ionic
(JEE 1986)

ans: (b)

Chemical Bonding - True or False Type

1. Linear overlap of two atomic p-orbitals leads to a sigma bond. (JEE 1983)

True

2. The H-N-H bond angle in NH3 is greater than the H-As-H bond angle in AsH3.

True

Reason: Repulsion is more in NH3 which makes the bond angle greater than in AsH3.

3. All molecules with polar bonds have dipole moment. (JEE 1985)

False.

Reason; If symmetrical arrangement of atoms is there, there is no dipole moment. Example CCl4.

4. SnCl2 is nonlinear molecule. (JEE 1985)
True

There is a lone pair in the bond. Due to repulsion between Lone pair and bonding pair, the bond angle less than 180°.

5. sp² hybrid orbitals have equal s and p character.

False

sp² hybrid use one s orbital and 2 p orbital for hydridisation. Hence sp² hybrid orbitals have 1/3 s character and 2/3 p character.

6. All the Al-Cl bonds in Al2Cl6 are equivalent. (JEE 1989)

False

The terminal Al-Cl bonds are different from the bridge Al-Cl bonds.

7. Nitric oxide, though an odd electron molecule, is diamagnetic in liquid state. (JEE 1991)

False

In liquid state, some dimerization takes place, but it is only partial. So it is still paramagnetic only.

8. Dipole moment of CH3F is greater than CH3Cl. (JEE 1993)
False

Bond distance is more in CH3Cl and hence more dipole moment.
Dipole moment = charge * distance

Chemical Bonding - 11 - Fill in the Blanks Type Questions

Fill in the blanks

1. There are ____________________ π (pi) bonds in a nitrogen molecule. (JEE 1982)
Anwer : 2

2. __________ hybrid orbitals of nitrogen are involved in the formation of ammonium ion. (JEE 1982)
Answer sp³

3. The terminal carbon atom in butane is _____________ hybridized. (JEE 1985)
Answer sp³



The shape of [CH3] ⁺ is ------------------------.
(JEE 1990)
Answer: Triangular planar

The valence atomic orbitals of carbon in silver acetylide is _________________.
(JEE 1990)

Answer: sp

IN P4O10, the number of oxygen atoms bonded to each phosphorus atom is ____________ .
(JEE 1992)

Answer: 4

When N2 goes to N2⁺
The N—N bond distance _________ and when O2 goes to )2⁺, the O—O bond distance ______________.

(JEE 1996)
Answer: increases, decreases

Chemical Bonding - 12 - True or False type Questions

State whether the following statements are True or False.

1. Linear overlap of two atomic p-orbitals leads to a sigma bond. (JEE 1983)

True

2. The H-N-H bond angle in NH3 is greater than the H-As-H bond angle in AsH3. (JEE 1984)

True. Repulsion among bonds is more in NH3 and it makes bond angle greater.

3. All molecules with polar bonds have dipole moment. (JEE 1985)

False. Symmetrical molecules will have zero dipole moment.

4. SnCl2 is nonlinear molecule (JEE 1985)

True

5. sp² hybrid orbitals have equal s- and p- character (JEE 1987)

False. One third s and two thirds p.


The presence of polar bonds in a polyatomic molecules suggests that molecule has non-zero dipole moment (JEE 1990)

False. Some polyatomic molecules having polar bonds have zero dipole moment.


H2O molecule is linear. (JEE 1993)

False. It is V-shaped.

The dipole moment of CH3F is greater than that of CH3Cl. (JEE 1993)

False. Dipole moment in CH3F is less than CH3Cl as bond length is shorter in CH3F. Remember the definition of dipole moment from physics.