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Which gas is evolved when `PbO_(2)` is treated with conc `HNO_(3)` ?

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Which gas is evolved when `PbO_(2)` is treated with conc `HNO_(3)` ?
A. `NO_(2)`
B. `O_(2)`
C. `N_(2)`
D. `N_(2)O`
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Correct Answer - B
`PbO_(2)+HNO_(3)toPb(NO_(3))_(2)+H_(2)O+(1)/(2)O_2(g)`
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