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NEET levelSingle correct optionDifficulty 1 of 3qc113

On adding Nessler's reagent to a solution containing $NH X_{4} X^{+}$ ions, the observation is a

Awhite curdy precipitate
Bdeep blue solution
Cyellow precipitate soluble in excess reagent
Dbrown precipitate (or brown coloration)

Answer: D

Ammonia or ammonium ions react with alkaline

K X_{2} HgI X_{4}

to give the brown iodide of Millon's base,

HgO \cdot Hg (NH X_{2}) I

. White, blue and yellow observations belong to other ions and reagents.

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