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When the gases; sulphur dioxide and hydrogen sulphide mix in the presence of water, the reaction \( S O_{2}+2 H_{2} S \rightarrow \) \( 2 H_{2} O+3 S \) occurs Here hydrogen sulphide is acting as:

1. an oxidizing agent
2. a reducing agent
3. a dehydrating agent
4. a catalyst

Correct answer: a reducing agent

Solution

In H2S, sulfur has oxidation state -2, and it ends up as elemental sulfur with oxidation state 0. Since hydrogen sulfide loses electrons by being oxidized, it causes SO2 to be reduced, so H2S acts as the reducing agent.

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