Question
Nitric acid is an oxidising agent and reacts with PbO but it does not react with PbO2 . Explain why?
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Answer
Nitric acid is an oxidising agent that means it oxidises an element from the loweroxidation state to higher oxidation state. In PbO, lead is in lower oxidation state +2. Nitricacid oxidises lead from Pb2+ to Pb4+. Whereas in PbO2, lead is in +4 oxidation state,which can not be oxidised further.
$\text{PbO}+2\text{HNO}_3\xrightarrow{ \ \ \ \ \ \ \ \ }\text{Pb(NO}_3)_2+\text{H}_2\text{O}$
$\text{PbO}+2\text{HNO}_3\xrightarrow{ \ \ \ \ \ \ \ \ }\text{Pb(NO}_3)_2+\text{H}_2\text{O}$
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