(B) Ammonia $(NH_3)$ is a basic gas. To dry it,a basic drying agent must be used. $P_4O_{10}$ is acidic,$H_2SO_4$ is acidic,and $CaCl_2$ forms an addu

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(B) Ammonia $(NH_3)$ is a basic gas. To dry it,a basic drying agent must be used. $P_4O_{10}$ is acidic,$H_2SO_4$ is acidic,and $CaCl_2$ forms an adduct with $NH_3$ $(CaCl_2 \cdot 8NH_3)$. Therefore,quicklime $(CaO)$ is used as a drying agent for ammonia because it is basic and does not react with $NH_3$.