pBlock ElementsII 1 Question 40
40. A gas that cannot be collected over water is
(a) $\mathrm{N} _{2}$
(b) $\mathrm{O} _{2}$
(c) $\mathrm{SO} _{2}$
(d) $\mathrm{PH} _{3}$
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Answer:
Correct Answer: 40. (c)
Solution:
- $\mathrm{SO} _{2}$ cannot be collected over water because it reacts with water forming $\mathrm{H} _{2} \mathrm{SO} _{3}$.
$$ \mathrm{SO} _{2}+\mathrm{H} _{2} \mathrm{O} \longrightarrow \mathrm{H} _{2} \mathrm{SO} _{3} $$
