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SO2 acts as oxidising and reducing agent...

`SO_2` acts as oxidising and reducing agent.

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i) Hydrogen acts as an oxidising agent while reacting with highly electropositive metals. For example,
a) `2Na + H_2 overset("heat")(to) 2NaH` b) `Ca + H_2 overset("heat")(to) CaH_2`
In both these reactions, hydrogen acts as an oxidising agent.
ii) Hydrogen acts as reducing agent as it removes oxygen from the oxides of metal upon heating. For example,
`a) CuO+ H_2 oversert("Heat")(to) Cu + H_2O b) ZnO + H_2 overset("heat")(to) Zn + H_2O`
In both these reactions, hydrogen acts as a reducing agent.
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