pBlock ElementsII 1 Question 41
41. Ammonia gas can be dried by
(a) conc $\mathrm{H} _{2} \mathrm{SO} _{4}$
(c) $\mathrm{CaCl} _{2}$
(b) $\mathrm{P} _{2} \mathrm{O} _{5}$
(d) quicklime
$(1978,1 M)$
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Answer:
Correct Answer: 41. (d)
Solution:
- Quicklime $(\mathrm{CaO})$ is used for drying $\mathrm{NH} _{3}$ gas because both are basic, do not react. On the other hand, $\mathrm{H} _{2} \mathrm{SO} _{4}$ and $\mathrm{P} _{2} \mathrm{O} _{5}$ are acidic, reacts with ammonia forming salts. $\mathrm{CaCl} _{2}$ forms complex with ammonia.
