Question

In the following reaction: \[ SO_2 + 2H_2S \rightarrow 3S + 2H_2O \] Which of the following statements is correct?

• A. Sulphur is reduced and oxygen is oxidised
• B. Sulphur is both oxidised and reduced
• C. Sulphur is oxidised and Hydrogen is reduced
• D. Hydrogen is oxidised and Sulphur is reduced

Hint:

In redox reactions, oxidation refers to the loss of electrons, while reduction refers to the gain of electrons. When a substance both gains and loses electrons, it is both oxidised and reduced.

Answer 1

The Correct Option is B

In this reaction, sulfur dioxide (\( SO_2 \)) is reduced to sulfur (\( S \)), and hydrogen sulfide (\( H_2S \)) is oxidized to sulfur.

• Sulfur in \( SO_2 \) changes from an oxidation state of \( +4 \) to \( 0 \) (reduction).
• Sulfur in \( H_2S \) changes from an oxidation state of \( -2 \) to \( 0 \) (oxidation).

Therefore, sulfur undergoes both reduction and oxidation, making answer (B) correct.