Q.

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

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a

NO2

b

O2

c

N2

d

N2O

answer is B.

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Detailed Solution

PbO2 is powerful oxidising agent and liberates O2 when treated with acids.PbO2+2HNO3⟶PbNO32+H2O+12O2PbO2+4HCl⟶PbCl2+2H2O+Cl2
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Which gas is evolved when PbO2 is treated with conc HNO3?