BITSAT Chemistry Chemical Bonding and Molecular Structure MCQs

Question: Which of the following shows correct order of bond length?

a) O₂⁺ > O₂ > O₂ ^– > O₂ ^2–

b) O₂⁺ < O₂^– > O₂ < O₂^2–

c) O₂⁺ > O₂ < O₂^– > O₂^2–

d) O₂⁺ > O₂ < O₂^– > O₂^2–

Answer: O₂⁺ < O₂^– > O₂ < O₂^2–

Question: Which of these compounds are directional?

a) NaCl

b) CO₂

c) BaO

d) CsCl₂

Answer: CO₂

Question: In , the formal charge on each oxygen atom and the P - O bond order respectively are

a) –0.75, 0.6

b) –0.75, 1.0

c) –0.75, 1.25

d) –3, 1.25

Answer: –0.75, 1.25

Question: Which one of the following does not follow octate rule?

a) PF₃

b) BF₃

c) CO₂

d) CCl₄

Answer: BF₃

Question: The P—P—P angle in P₄ molecule and S—S—S angle in S₈ molecule is (in degree) respectively

a) 60°, 107°

b) 107°, 60°

c) 40°, 60° 

d) 60°, 40°

Answer: 60°, 107°

Question: Which of the following molecule/ion has all the three types of bonds, electrovalent, covalent and co-ordinate :

a) HCl

b) NH₄⁺

c) Cl^-

d) H₂O₂

Answer: NH₄⁺

Question: The molecules BF₃ and NF₃ are both covalent compounds, but BF₃ is non polar whereas NF₃ is polar. The reason for this is

a) Atomic size of Boron is larger than nitrogen

b) Boron is metal while nitrogen is gas

c) B – F bonds are non-polar while N – F bonds are polar

d) BF₃ is planar but NF₃ is pyramidal

Answer: BF₃ is planar but NF₃ is pyramidal

Question: Which one of the following pairs is isostructural (i.e., having the same shape and hybridization)?

a) [BCl₃ and BrCl₃^-]

b) [NH₃ and NO^₃-

c) [NF₃ and BF₃]

d) [BF₄^- and NH₄⁺]

Answer: [BF₄^- and NH₄⁺]

Question: N₂ and O₂ are converted into mono anions,N₂^– and O₂^– respectively. Which of the following statements is wrong ?

a) In N₂, the N—N bond weakens

b) In O₂, the O—O bond order increases

c) In O₂, bond length decreases

d) N₂^– becomes diamagnetic

Answer: In O₂, the O—O bond order increases

Question: Number of bonds in SO₂ are

a) Two σ and Two π

b) Two σ and One π

c) Two σ , two π and one lone pair

d) None of these

Answer: Two σ , two π and one lone pair

Question:  The vapour pressure of due to

a) Dipole moment

b) Dipole- dipole interaction

c) H – bonding

d) Lattice structure

Answer: H – bonding

Question: A σ bonded molecule MX₃ is T-shaped. The number of non bonded pair of electrons is

a) 0

b) 2

c) 1

d) can be predicted only if atomic number is known

Answer: 2

Question: The correct bond order in the following species is:

a)

b)

c)

d)

Answer:

Question: Which of the following statements is/are true

1. PH₅ and BiCl₅ do not exist

2. pπ – dπ bond is present in SO₂

3. has bent geometry

4. SeF₄ and CH₄ have same shape

a) 1, 2, 3

b) 1, 3

c) 1, 3, 4

d) 1, 2, 4

Answer: 1, 2, 3

Question: Which of the following two are isostructural ?

a)

b) NH₃, BF₃

c)

d) PCI₅, ICI₅

Answer:

Question: Two ice cubes are pressed over each other until they unite to form one block. Which one of the following forces dominates for holding them together?

a) Dipole-dipole interaction

b) Van der waals’ forces

c) Hydrogen bond formation

d) Covalent attraction

Answer: Hydrogen bond formation

Question: Which of the following hydrocarbons has the lowest dipole moment ?

a)

b) CH₃C º CCH₃

c) CH₃CH₂C º CH

d) CH₂ = CH – C º CH

Answer: CH₃C º CCH₃

Question: In the dichromate dianion,

a) 4 Cr – O bonds are equivalent

b) 6 Cr – O bonds are equivalent

c) All Cr – O bonds are equivalent

d) All Cr – O bonds are nonequivalent

Answer: 6 Cr – O bonds are equivalent

Question: In piperidine the hybrid state assumed by N is

a) sp

b) sp²

c) sp³

d) dsp²

Answer: sp³

Question: Which of the following is the correct electron dot structure of N₂O molecule?

a)

b)

c)

d)

Answer: