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Redox Reactions — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistryRedox Reactions2 Marks
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 $\mathrm{Pb}^{2+}$ to $\mathrm{Pb}^{4+}$. Whereas in $\mathrm{PbO}_2$, lead is in +4 oxidation state, which can not be oxidised further.
$\text{PbO}+2\text{HNO}_3\xrightarrow{ \ \ \ \ \ \ \ \ }\text{Pb(NO}_3)_2+\text{H}_2\text{O}$

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