Q.
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a
PbO2 reacts with HCl to evolve Cl2 gas
b
PbO2 reacts with HNO3 to evolve O2 gas
c
Pb3O4 reacts with HCl to evolve Cl2 gas
d
Pb3O4 reacts with HNO3 to form PbO2, but O2 is not liberated
answer is A.
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