Nessler's reagent is used to detect the zero group radical. The characteristic brown precipitate for — Qualitative and Quantitative Analysis Chemistry Question
Question
Nessler's reagent is used to detect the zero group $NH_4^+$ radical. The characteristic brown precipitate formed during this test, chemically known as the Iodide of Millon's base, has the precise formula:
Answer: C
💡 Solution & Explanation
The reaction of ammonia with alkaline $K_2HgI_4$ (Nessler's reagent) yields a brown precipitate of basic mercury(II) amido-iodine. Its stoichiometric formula is $HgO \cdot Hg(NH_2)I$.
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