Question

Name the reagent that gives brown precipitate with a gas obtained by heatin
ammonium chloride salt and concentrated sodium hydroxide solution.

Answer 1

Answer:

Nesseler's reagent is an alkaline solution of Potassium tetraiodomercurate(II) (K 2 [HgI4 ]).

It is prepared by combining potassium iodide (KI) and mercuric chloride (HgCl 2)

It is made slightly alkaline by adding KOH or NaOH.

On being reacted with gaseous ammonia it produces brown fumes and on being passed through a solution of ammonia, it gives a dirty brown precipitate. The reaction involved is:

2K2(Hgl4) + 3KOH + NH3 --->

(OHG2.NH2)I + 7KI + 2H2O

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Answer 2

Answer:

Your answer will be nesselers reagents