Nesslers reagent is ______

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R-Mg X

alkaline $K_{2} H g I_{4}$

$A g N O_{3} + N H_{4} O H$

$[C u {(N H_{3})}_{4}] S O_{4}$

answer is B.

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Detailed Solution

Nessler's reagent is an aqueous solution of potassium iodide, mercuric chloride, and potassium hydroxide. Its chemical formula is K₂HgI₄. It is used to detect the presence of ammonia. It turns into pale brown colour in presence of ammonia

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