ANS:B - quick lime

Ammonia gas can be dried by quick lime (calcium oxide). When quick lime (CaO) is exposed to ammonia gas (NH3), it reacts to form calcium hydroxide [Ca(OH)2] and solid ammonium chloride (NH4Cl). This reaction helps in removing the moisture (water vapor) present in the ammonia gas, thereby drying it. The reaction can be represented as follows: CaO+2NH3​→Ca(OH)2​+2NH4​Cl Quick lime is commonly used as a drying agent for ammonia gas due to its ability to react with water and form calcium hydroxide, thereby effectively drying the gas.