Question

To dry ammonia gas the drying agent used is

• A. conc. $\ce{H_2SO_4}$
• B. $\ce{P_2O_5}$
• C. quick lime
• D. anhydrous $\ce{CaCl_2}$

Answer 1

Answer: (C)

quick lime

Answer 2

Moist ${NH_3}$ is dried over quick lime ${(CaO)}$. lt cannot be dried over cone. ${H_2SO_4}$ or ${P_2O_5}$ because being basic it forms Salts with them. Anhydrous ${CaCl_2}$ also cannot be used because it forms a complex ${CaCl_2.8NH_3}$ with ammonia.