(2005)
(a) $\mathrm{NO} _{2}$
(b) $\mathrm{O} _{2}$
(c) $\mathrm{N} _{2}$
(d) $\mathrm{N} _{2} \mathrm{O}$
Correct Answer: 22. (b)
Solution:
PbO _{2}+HNO _{3} \longrightarrow Pb(NO _{3}) _{2}+H _{2} O+NO _{2}
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