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On passing a gas, ‘X’, through Nessler’s reagent, a brown precipitate is obtained. The gas ‘X’ is

1. Cl2
2. NH3
3. H2S
4. CO2

Correct answer: NH3

Solution

Nessler's reagent is specifically used to detect ammonia (NH3) in a solution, producing a brown precipitate when ammonia is present. This reaction is characteristic of ammonia, distinguishing it from the other gases listed.

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