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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)+4HNO_(3) to Pb(NO_(3))_(2)+2NO_(2)+2H_(2)O+O_(2)`.
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