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Nitric acid is an oxidising agent and re...

Nitric acid is an oxidising agent and reacts with PbO but it does not react with `PbO_(2)`. Explain why?

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PbO is a basic oxide and reacts with `HNO_3` and simple acid base reaction takes place.
`2PbO+4HNO_3 rarr 2Pb(NO_3)_2+2H_2O`
But in `PbO_2` , lead is in +4 oxidation state and cannot be further oxidised . Therefore , it does not react with `HNO_3`.
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