Correct Answer: Option D

Explanation

\(H_2SO_4\) and \(CaCl_2\) are not suitable for drying ammonia gas because they react with the gas.

Ammonia is a basic gas, and both \(H_2SO_4\) and \(CaCl_2\) are acidic. When these two substances react, they form salts that contain ammonia. This can contaminate the ammonia gas and make it unusable.

In addition, \(H_2SO_4\) is a corrosive substance, and \(CaCl_2\) can be harmful to breathe in. Therefore, it is not safe to use these substances to dry ammonia gas.

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