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SO2 act as both oxidising and reducing a...

`SO_2` act as both oxidising and reducing agent but `H_2S` acts as only reducing agent. Why ?

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`H_(2)S` is acting as a reducing agent because in hydrides of oxygen family as we move from O to S there is decrease in the thermal stability, due to this acidic character increases and reducing character increases on the other hand in `SO_(2)`, +6 O.S. is more stable than +4 O.S `SO_2` is acting as reducing agent. But after S in oxygen family stability of +6 0.S. decreases downwards. So oxidising character increase. That.s why `SO_(2)` acting as oxidising as well as reducing agent.
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