Selected MCQ

Current Question
Which species shows strongest hydrogen bonding?
  • A. NH₃
  • B. H₂O
  • C. HF
  • D. CH₄
Correct Answer: C
Explanation:
HF has highly polar H–F bond and strong intermolecular attraction.
Related Question 1
Which species is strongest nucleophile?
  • A. H₂O
  • B. NH₃
  • C. OH⁻
  • D. Cl⁻
Correct Answer: C
Explanation:
OH⁻ has high electron density.
Related Question 2
Which statement about hydrogen bonding is correct?
  • A. It occurs only in hydrocarbons
  • B. It requires hydrogen bonded to highly electronegative atoms such as N, O, or F
  • C. It is weaker than all London forces
  • D. It is a covalent bond between two molecules
Correct Answer: B
Explanation:
Strong intermolecular hydrogen bonding needs a polarized H attached to N, O, or F.
Related Question 3
Which wave shows polarization?
  • A. Sound
  • B. Light
  • C. Water
  • D. Seismic
Correct Answer: B
Explanation:
Only transverse waves polarize.
Related Question 4
Which rock shows banding?
  • A. Granite
  • B. Basalt
  • C. Gneiss
  • D. Limestone
Correct Answer: C
Explanation:
Gneiss has distinct layers.
Related Question 5
Which species is isoelectronic with Ne?
  • A. Na⁺
  • B. Mg²⁺
  • C. F⁻
  • D. All of the above
Correct Answer: D
Explanation:
All have 10 electrons like neon.