A) \[CaO\]
B) \[HN{{O}_{3}}\]
C) \[{{P}_{2}}{{O}_{5}}\]
D) \[CuS{{O}_{4}}\]
Correct Answer: A
Solution :
(i) \[\because \]\[N{{H}_{3}}\] reacts with\[{{P}_{2}}{{O}_{5}}\]or\[CaC{{l}_{2}}\]or cone. \[{{H}_{2}}S{{O}_{4}}\] \[\therefore \]it cannot be dried over either of them. (ii)\[CuS{{O}_{4}}\]and\[HN{{O}_{3}}\]are not drying agent. \[\therefore \]\[N{{H}_{3}}\]can be dried over\[CaO\]only because it is a drying agent with which it does not react.
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