Which of the following 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 O

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N_{2} O

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Solution

The correct option is B $O_{2}$
When $P b O_{2}$ is treated with conc. $H N O_{3}$ it evolves Oxygen gas.
$2 P b O_{2} + 4 H N O_{3} \to 2 P b (N O_{3})_{2} + 2 H_{2} O + O_{2}$
Hence option B is correct.

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