Q.

When PbO2 reacts with concentrated HNO3, the gas evolved is

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a

N2

b

N2O

c

O2

d

NO2

answer is B.

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Detailed Solution

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PbO2​ is a powerful oxidising agent and liberate O2​ when treated with conc. HNO3.

PbO2​+conc.HNO3​→Pb(NO3​)2​+H2​O+O2.

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