A) cone.\[{{H}_{2}}S{{O}_{4}}\]
B) anhyd.\[CaC{{l}_{2}}\]
C) \[{{P}_{2}}{{O}_{5}}\]
D) \[CaO\]
Correct Answer: D
Solution :
\[\because \]Ammonia reacts with anhydrous\[CaC{{l}_{2}},{{P}_{2}}{{O}_{5}}\]and cone.\[{{H}_{2}}S{{O}_{4}}\]. \[\therefore \]it cannot be dried over them. \[\therefore \]it can be dried by\[CaO\]only.
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