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Q.

Nessler’s reagent is :

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a

K2HgI4

b

K2HgI4+KI

c

K2HgI4+KOH

d

K2HgI2+KOH

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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