Question

Select all the methods from the given options by which ammonia gas can be identified

• A. It will have a strong pungent smell in the odour test
• B. It will turn moist blue litmus paper red
• C. It will turn phenolphthalein solution pink in colour
• D. The reaction with Nessler's solution produces a white precipitate

Answer 1

Answer: (A), (C)

The correct options are
A

It will have a strong pungent smell in the odour test

C

It will turn phenolphthalein solution pink in colour

(1) Ammonia gas has a strong pungent smell which can be used to identify it in the odour test.

(2) Ammonia gas is basic in nature so it turns red litmus blue and not blue litmus red.

(3) Ammonia gas will turn phenolphthalein solution pink in colour as ammonia is basic in nature.

(4) The reaction of ammonia with Nessler's solution produces a brown precipitate and not a white precipitate.

Hence the test in point (1) and (3) are the correct answer.