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Name a drying agent for ammonia. Why are other drying agents such as P2O5 and CaCl2 are not used?

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The drying agent used is CaO in case of ammonia.

Other drying agents like P2O5 and CaCl2 are not used. As ammonia being basic reacts with them.

6NH3 + P2O5 + 3H2 2(NH4)3PO4

CaCl2 + 4NH3 CaCl2.4NH4

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