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Select the incorrect statement(s).

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Ammonium ions produce yellow colour solution with sodium hexanitrito-N-cobaltate (Ill).

Ammonia gas develops a brown colour on filter paper moistened with a solution of ${MnCl}_{2}$ and $H_{2} O_{2}$ .

Ammonium ions produce white precipitate with saturated sodium hydrogen tartrate solution.

Ammonium salts in presence of sodium hydroxide solution produces red precipitate with 4-nitrobenzene diazonium chloride reagent.

answer is A, D.

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Detailed Solution

(a) Ammonium ions produce yellow colour solution with sodium hexanitrito-N-cobaltate (Ill).

$\underset{(Yellow ppt .)}{{({NH}_{4})}_{3} [Co {({NO}_{2})}_{6}]} ↓$

(D) Ammonium salts in presence of sodium hydroxide solution produces red precipitate with 4-nitrobenzene diazonium chloride reagent.

$O_{2} N$ Question Image $N = N - Cl + {NH}_{4}^{+} + 2 {OH}^{-}$

$O_{2} N$ Question Image $N \equiv {NONH}_{4} + {Cl}^{-} + H_{2} O$

(Red colouration)

Thus, options A and D are correct.

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