Selected MCQ

Current Question
Which gas supports life?
  • A. CO₂
  • B. O₂
  • C. N₂
  • D. He
Correct Answer: B
Explanation:
Oxygen is essential for respiration.
Related Question 1
For a first-order reaction, the half-life is:
  • A. Dependent on initial concentration
  • B. Independent of initial concentration
  • C. Zero-order only
  • D. Proportional to activation energy only
Correct Answer: B
Explanation:
First-order half-life is constant for a given rate constant.