Selected MCQ

Current Question
Which gas causes acid rain?
  • A. CO₂
  • B. SO₂
  • C. O₂
  • D. N₂
Correct Answer: B
Explanation:
SO₂ forms sulfuric acid in atmosphere.
Related Question 1
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 2
Which instrument measures rainfall?
  • A. Hygrometer
  • B. Rain gauge
  • C. Barometer
  • D. Anemometer
Correct Answer: B
Explanation:
Rain gauge measures precipitation.
Related Question 3
Which gas causes global warming?
  • A. Oxygen
  • B. Nitrogen
  • C. CO₂
  • D. Helium
Correct Answer: C
Explanation:
CO₂ traps heat.
Related Question 4
Which acid is diprotic?
  • A. HCl
  • B. H₂SO₄
  • C. HNO₃
  • D. HF
Correct Answer: B
Explanation:
Sulfuric acid donates two protons.
Related Question 5
Which acid is strongest in water?
  • A. HF
  • B. HClO₄
  • C. H₂CO₃
  • D. CH₃COOH
Correct Answer: B
Explanation:
Perchloric acid fully dissociates.