Question

PbO₂ on reaction with conc. HNO₃ gives
(a) PbNO₂ + O₂
(b) Pb(NO₃)₂ + H₂O + $\frac{1}{2}$O₂
(c) Pb + N₂ + H₂O
(d) Pb(OH)₂ + N₂O

Answer 1

your answer is (b)

when PbO2 reacts with conc.HNO3 the oxygen gas is evolved.

PbO2+HNO3 ------------> PbNO3 + H2O + O2

hope it will help you