(C) $P_4O_{10}$ is an acidic oxide,whereas $NH_3$ is a basic gas. When $P_4O_{10}$ is used to dry $NH_3$,it reacts with $NH_3$ to form ammonium phosph

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$P_4O_{10}$ is acidic while $NH_3$ is basic

(C) $P_4O_{10}$ is an acidic oxide,whereas $NH_3$ is a basic gas. When $P_4O_{10}$ is used to dry $NH_3$,it reacts with $NH_3$ to form ammonium phosphate. The reaction is: $6NH_3 + P_4O_{10} + 6H_2O \rightarrow 4(NH_4)_3PO_4$. Therefore,it cannot be used as a drying agent for $NH_3$.