Selected MCQ

Current Question
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 1
Which factor increases weathering rate?
  • A. Low temperature
  • B. High rainfall
  • C. Lack of vegetation
  • D. Dry climate
Correct Answer: B
Explanation:
Water accelerates chemical weathering.
Related Question 2
Which factor increases reaction rate?
  • A. Lower temperature
  • B. Higher activation energy
  • C. Catalyst
  • D. Decreasing concentration
Correct Answer: C
Explanation:
Catalyst lowers activation energy.
Related Question 3
Which process increases entropy most?
  • A. Freezing water
  • B. Mixing gases
  • C. Crystallization
  • D. Condensation
Correct Answer: B
Explanation:
Mixing increases randomness.
Related Question 4
The Fermi energy increases with:
  • A. Temperature
  • B. Particle density
  • C. Pressure only
  • D. Volume only
Correct Answer: B
Explanation:
Higher density raises highest occupied energy level.
Related Question 5
Which hormone increases heart rate?
  • A. Insulin
  • B. Adrenaline
  • C. Thyroxine
  • D. Estrogen
Correct Answer: B
Explanation:
Adrenaline stimulates cardiac activity.