Question

When PbO₂ reacts with conc. HNO₃ the gas evolved is(a) NO₂ (b) O₂(c) N₂ (d) N₂O

Answer 1

Here is your answer:

b) O₂

2PbO₂ + 4HNO₃ → 2Pb(NO₃)₂ + 2H₂O + O₂