Which gas is evolved when $P b O_{2}$ is treated with conc $H N O_{3}$ ?

N O_{2}

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O_{2}

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N_{2}

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N_{2} O

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Solution

The correct option is C $O_{2}$
$P b O_{2}$ is a powerful oxidising agent and liberates $O_{2}$ when treated with acids.
The reaction is as follows:
$P b O_{2} + 2 H N O_{3} ⟶ P b {(N O_{3})}_{2} + H_{2} O + \frac{1}{2} O_{2}$
$2 P b O_{2} + 4 H C l ⟶ 2 P b {C l}_{2} + 2 H_{2} O + O_{2}$

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