Free MCQs & Online Quiz Practice for Exams

Q: What is the bond order in F₂ molecule according to molecular orbital theory? (Entry test 2013)

A) 2

B) 3

C) 1

D) 4

Q: Which one of the following compounds has the shortest carbon–halogen bond? (Entry test 2013)

A) CH₃F

B) CH₃Cl

C) CH₃Br

D) CH₃I

Q: Oxygen molecule has two unpaired electrons. It is therefore: (Entry test 2013)

A) Ferromagnetic

B) Diamagnetic

C) Electromagnetic

D) Paramagnetic

Q: The bond angle between H–C–C bonds in ethane is: (Entry test 2013)

A) 109.5°

B) 120°

C) 90°

D) 107.5°

Q: In which compound is the bond angle maximum? (Entry test 2014)

A) Methane

B) Beryllium chloride

C) Ammonia

D) Boron trifluoride

Q: Select the molecule that has unpaired electrons in anti-bonding molecular orbitals: (Entry test 2015)

A) N₂

B) Cl₂

C) H₂

D) O₂

Q: The shape of SnCl₂ is: (Entry test 2015)

A) Linear

B) Trigonal pyramidal

C) Angular

D) Trigonal planar

Q: Which one of the following has zero bond order? (Entry test 2015)

A) O₂

B) He₂

C) H₂

D) N₂

Q: Bond energy of covalent bond decreases with increase in: (Entry test 2016)

A) Polarity

B) Multiplicity

C) Size of atom

D) All of the above

Q: The existence of He₂ is not possible because: (Entry test 2017)

A) It would be disproportionate

B) It would be radioactive

C) It violates the Pauli Exclusion Principle

D) No H–H bond would form

Q: Considering the molecular orbital theory (MOT), choose the correct relative energy order: (Entry test 2017)

A) σ₁s<σ*₁s<σ₂s<σ*₂s<π₂p

B) σ₁s<σ*₁s<σ₂s<π₂p<σ*₂p

C) σ₁s<σ₂s<π₂p<σ*₂p

D) σ₁s<σ₂s<σ₂p<π₂p

Q: The bond energy of an H₂ molecule is: (Entry test 2017)

A) 436 kJ mol⁻¹

B) 407 kJ mol⁻¹

C) 272 kJ mol⁻¹

D) 236 ÷ Avogadro’s no

Q: Choose the molecule that could not be represented by a single electronic structure formula: (Entry test 2017)

A) CH₄

B) H₂O

C) SO₂

D) O₂

Q: According to MO theory the number of molecular orbitals in O₂ is: (ETEA 2018)

A) 10

B) 7

C) 8

D) 9

Q: Unhybrid ‘p’ orbitals on linear overlap: (ETEA 2018)

A) Always form π bond

B) Always form σ bond

C) Neither form σ nor π bond

D) Form more reactive & unstable π bond

Q: Specie with dipole moment equal to zero is: (ETEA 2018)

A) AlCl₃

B) CH₄

C) 1,4-Dibromobenzene

D) All of the above

Q: If the overlap of sp³ hybrid orbitals in carbon atoms is smaller, the bond formed is: (ETEA 2018)

A) Weak

B) Strong

C) Less energetic

D) More stable

Q: According to VSEPR theory, in which molecule the electron-pair geometry is pyramidal? (ETEA 2018)

A) CH₄

B) NH₃

C) BF₃

D) None of these

Q: The orbital with highest energy is: (ETEA 2018)

A) Hybrid

B) Unhybrid

C) Molecular

D) All are of equal energy

Q: The bond angle in H₂S is less than H₂O due to: (ETEA 2018)

A) Small size of oxygen

B) Greater EN of oxygen

C) Oxygen has two lone pairs

D) All of the above