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Explain that SO2 can act as an oxidising...

Explain that `SO_2` can act as an oxidising agent as well as a reducing agent, but `SO_3` can act as an oxidising agent only.

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As `SO_(20` has the tendency to show both +6 and+ 4 O.S. so it is acting as oxidising agent aS well as reducing agent. But in `SO_(3)`, S atom is in +6 O.S. (higher O.S.), it has no tendency to gain more electrons, it can only loose electrons so acting as oxidising agent.
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