Question

Which gas is evolved when $PbO_2$ is treated with concentrated $HNO_3$?

• A. $NO_2$
• B. $O_2$
• C. $N_2$
• D. $N_2O$

Answer 1

Answer: (B)

$O_2$

Answer 2

$PbO_2 + HNO_3 \longrightarrow Pb(NO_3 )_2 + H_2O + O_2$