Selected MCQ

Current Question
Which species acts as Lewis acid?
  • A. NH₃
  • B. H₂O
  • C. BF₃
  • D. OH⁻
Correct Answer: C
Explanation:
BF₃ accepts electron pair.
Related Question 1
The mineral calcite reacts vigorously with dilute hydrochloric acid because it is a:
  • A. Silicate
  • B. Sulfide
  • C. Carbonate
  • D. Oxide
Correct Answer: C
Explanation:
Carbonates effervesce by releasing (CO_2) upon acid reaction.
Related Question 2
Which factor increases acidity of organic compounds?
  • A. Electron donating groups
  • B. Electron withdrawing groups
  • C. Alkyl substitution
  • D. Decreasing electronegativity
Correct Answer: B
Explanation:
Electron-withdrawing stabilizes conjugate base.
Related Question 3
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.
Related Question 4
Which force acts on charged particles?
  • A. Gravitational
  • B. Magnetic
  • C. Electric
  • D. Nuclear
Correct Answer: C
Explanation:
Electric force acts on charges.
Related Question 5
Which acid is diprotic?
  • A. HCl
  • B. H₂SO₄
  • C. HNO₃
  • D. HF
Correct Answer: B
Explanation:
Sulfuric acid donates two protons.