H2S acts only as reducing agent while SO2 can act both as reducing as well as oxidising agent.

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H²S acts only as reducing agent while SO² can act  as reducing as well as oxidising agent.


Ans- S in H²S is in the oxidation state of -2, which is the minimum oxidation state of S. It can only increase it's oxidation state and thus act as a reducing agent. On the other hand, the oxidation state of (S) in So² is +4 which lies in between 2 and +6. It can both increase (reducing agent) and decrease (oxidising agent) it's oxidation number . Therefore, it can act both as oxidising as well as reducing agent.

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