Nessler's reagent is an aqueous solution which contains:

Sodium chloride

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Mercuric chloride and Potassium hydroxide

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Sodium hydroxide

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Potassium nitrate

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Solution

The correct option is B Mercuric chloride and Potassium hydroxide
Nessler's reagent is an aqueous solution of potassium iodide, mercuric chloride, and potassium hydroxide. Its chemical formula is $K_{2} H g I_{4}$ . It is used to detect the presence of ammonia. It turns into pale brown colour in presence of ammonia.

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