Question

8] In the confirmatory test for NH4+ radical, O.S. + Nessler's reagent gives precipitate. a) Yellow b) Brown c) Green d) Blue
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Answer 1

Answer:

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Answer 2

Nessler's reagent reaction as a confirmatory test for $NH_4^+$ radical

Explanation:

• Nessler's reagent is alkaline solution of potassium tetra-iodo-mercurate.
• $NH_4^+$ radical test is done using Nessler's reagent . The color of precipitate changes to brown when the reaction is carried out in basic medium.
• The precipitate formed is due to a compound $(Hg_2O.NH_2)$ which renders a brown color.
• The reaction that occurs is as follows :

$2K_2HgI_4 +NH_4Cl +4KOH \rightarrow 7KI + KCl +3H_2O$+ iodide of millon's base(brown color)

• This reaction is a test for the ammonium radical or even ammonia.