How is ammonia gas prepared in the lab?

Answer 1

is by reacting it with chlorine so that you will have ammonium chloride as your product, that will have a white fume

Answer 2

Ammonia gas can be prepared in the lab by directly reacting ammonia with an acid such as hydrochloric acid. The reaction produces ammonium chloride, which can then be heated to release ammonia gas. Another method is by heating a mixture of ammonium salt and a strong base such as sodium hydroxide, which also releases ammonia gas.