Which of the following is a method of qualitatively analyzing a given salt for presence of ammonia?

Solution turns blue litmus red

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Heating the salt causing decrepitation

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Using a reagent to obtain dirty brown precipitate

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Addition of NaOH causing white gelatinous precipitate

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Solution

The correct option is C Using a reagent to obtain dirty brown precipitate
Typically, Nessler’s reagent is used to test for ammonia. Nessler’s reagent is an alkaline solution of potassium tetraiodomercurate (II). When it combines with ammonia, it gives dirty brown precipitate due to the formation of $[O H g_{2} . N H_{2}] I$ complex.

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