pBlock ElementsII 1 Question 22
22. Which gas is evolved when $\mathrm{PbO} _{2}$ is treated with concentrated $\mathrm{HNO} _{3}$ ?
(2005)
(a) $\mathrm{NO} _{2}$
(b) $\mathrm{O} _{2}$
(c) $\mathrm{N} _{2}$
(d) $\mathrm{N} _{2} \mathrm{O}$
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Answer:
Correct Answer: 22. (b)
Solution:
- $\mathrm{PbO} _{2}+\mathrm{HNO} _{3} \longrightarrow \mathrm{Pb}\left(\mathrm{NO} _{3}\right) _{2}+\mathrm{H} _{2} \mathrm{O}+\mathrm{O} _{2}$
