Which gas is evolved when PbO₂ is treated with conc HNO₃?

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N₂

N₂O

O₂

NO₂

answer is B.

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Detailed Solution

PbO₂ is powerful oxidising agent and liberates O₂ when treated with acids.

$\begin{array}{l} {PbO}_{2} + 2 {HNO}_{3} ⟶ Pb {({NO}_{3})}_{2} + H_{2} O + \frac{1}{2} O_{2} \\ {PbO}_{2} + 4 HCl ⟶ {PbCl}_{2} + 2 H_{2} O + {Cl}_{2} \end{array}$

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