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Chemical Bonding and Molecular Structure MCQs

Class 11 Chemistry — questions with answers and worked explanations.

20 free questions Class 11 Chemistry Answers + explanations No sign-up

These questions are drawn from the Pariksha Sutra question bank for Chemical Bonding and Molecular Structure, part of the Class 11 Chemistry syllabus. Each one shows the correct answer and, where a method helps, the working behind it.

Read the question, decide your answer before looking, then check the explanation — that is what turns practice into marks. If a question catches you out, the explanation is the part worth re-reading.

Questions

Question 1
Which of the following compounds is predominantly ionic in nature?
  1. CO2
  2. CsF
  3. HCl
  4. CH4
Answer: CsF
Question 2
In the Lewis structure of CO (carbon monoxide) with a triple bond, the formal charge on carbon is:
  1. +1
  2. -1
  3. +2
  4. 0
Answer: -1
Question 3
The molecular geometry of SF4 (with one lone pair on S) is:
  1. Trigonal pyramidal
  2. Square planar
  3. Tetrahedral
  4. See-saw
Answer: See-saw
Question 4
The hybridization of phosphorus in PCl5 is:
  1. sp3d2
  2. sp3
  3. sp2
  4. sp3d
Answer: sp3d
Question 5
The paramagnetic behaviour of O2 is explained by molecular orbital theory because it has:
  1. No unpaired electrons
  2. All electrons paired in bonding orbitals
  3. Two unpaired electrons in pi* orbitals
  4. One unpaired electron in sigma orbital
Answer: Two unpaired electrons in pi* orbitals
Question 6
The formal charge on the central oxygen atom in ozone (O3) is:
  1. 0
  2. +1
  3. -1
  4. +2
Answer: +1
Question 7
The shape of the PCl5 molecule as predicted by VSEPR theory is:
  1. Square pyramidal
  2. Tetrahedral
  3. Octahedral
  4. Trigonal bipyramidal
Answer: Trigonal bipyramidal
Question 8
The hybridization of the central carbon in ethene (C2H4) is:
  1. sp3d
  2. sp2
  3. sp
  4. sp3
Answer: sp2
Question 9
Which species does NOT exist according to molecular orbital theory (bond order zero)?
  1. H2-
  2. He2
  3. He2+
  4. H2+
Answer: He2
Question 10
Hydrogen bonding occurs when hydrogen is bonded to which of the following elements?
  1. Carbon, sulfur, phosphorus
  2. Boron, silicon, aluminium
  3. Fluorine, oxygen, nitrogen
  4. Chlorine, bromine, iodine
Answer: Fluorine, oxygen, nitrogen
Question 11
According to Fajans' rules, which factor increases the covalent character of an ionic bond?
  1. Low cation charge
  2. Small cation and large anion
  3. Large cation size
  4. Noble-gas configuration of cation
Answer: Small cation and large anion
Question 12
The formal charge on nitrogen in the ammonium ion NH4+ is:
  1. +1
  2. 0
  3. +2
  4. -1
Answer: +1
Question 13
The shape of the XeF4 molecule is:
  1. Octahedral
  2. Square planar
  3. See-saw
  4. Tetrahedral
Answer: Square planar
Question 14
The number of sigma and pi bonds in ethyne (C2H2) respectively is:
  1. 2 sigma and 3 pi
  2. 4 sigma and 1 pi
  3. 3 sigma and 2 pi
  4. 3 sigma and 3 pi
Answer: 3 sigma and 2 pi
Question 15
The bond order of the nitrogen molecule (N2) is:
  1. 2
  2. 1
  3. 2.5
  4. 3
Answer: 3
Question 16
The lattice enthalpy of an ionic solid is highest when the ions have:
  1. Small size and low charge
  2. Small size and high charge
  3. Large size and high charge
  4. Large size and low charge
Answer: Small size and high charge
Question 17
In the sulfate ion SO4^2- drawn with two S=O double bonds, the formal charge on sulfur is:
  1. +2
  2. +1
  3. 0
  4. -2
Answer: 0
Question 18
The shape of the ClF3 molecule (with two lone pairs on Cl) is:
  1. Bent
  2. Trigonal pyramidal
  3. Trigonal planar
  4. T-shaped
Answer: T-shaped
Question 19
In which of the following is the central atom sp hybridized?
  1. BeCl2
  2. CH4
  3. NH3
  4. BF3
Answer: BeCl2
Question 20
An electron in an antibonding molecular orbital:
  1. Decreases the stability of the molecule
  2. Increases the stability of the molecule
  3. Has no effect on bond order
  4. Always increases bond order
Answer: Decreases the stability of the molecule

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