Which one of the following gas smells like a rotten egg?

  1. A. Ammonia
  2. B. Hydrogen sulphide
  3. C. Acetylene
  4. D. Sulphur dioxide

Correct Answer: B. Hydrogen sulphide

Explanation

Hydrogen sulphide (H_2S) is a toxic, colorless gas famous for its characteristic foul odor of rotten eggs.

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