Which is used for drying ammonia ?

Which one of the following is used for drying of ammonia ?

Which one of the following is used for drying of ammonia ?

State why concentrated sulphuric acid is not used for drying ammonia gas

Give areason why -i]Concentrated sulphuric acid ,is not used for drying ammonia gas ii] Ammonia gas is not collected over water.

Why cannot substances such as conc. H_2SO_4 , anhydrous calcium chloride and phosphorus pentoxide be used for drying ammonia gas?

Why concn H_2SO_4 and CaCl_2 is not used for drying Ammonia?

Which of the following is used to dry moist ammonia?

Name the substance used for drying ammonia.