WBCS.LIVE practice question

Which of the following chemical substances can act strictly ONLY as a reducing agent in a chemical reaction?

Solve this multiple-choice question and check the correct answer with its explanation below.

Answer options

  1. H2O2
  2. SO2
  3. H2S
  4. HNO3

Correct answer and explanation

Correct answer: H2S

Explanation: āœ… Correct Answer: C) H2S šŸ“š Explanation: In Hydrogen Sulfide (H2S), the sulfur atom is in its absolute lowest possible oxidation state of -2. Because it cannot be reduced any further, it can only undergo oxidation (losing electrons) to reach higher states like 0 or +4. Since it can only be oxidized, it functions exclusively as a powerful reducing agent in chemical reactions.