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pH of Salts

The reagent u...

Question

The reagent used for the identification of Ammonium cation in the analysis of a simple salt is

A

K l

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B

K_{2} H g I_{4}

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C

K_{2} C r O_{4}

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D

K_{4} [F e (C N)_{6}]

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Solution

The correct option is B $K_{2} H g I_{4}$
The reagent used for the identification of Ammonium cation in the analysis of a simple salt is $K_{2} H g I_{4} .$ The ammonia gas formed by the reaction of ammonium ion with $N a O H$ reacts with Nessler's reagent to form brown ppt of $H_{2} N$ , $H g O$ , $H g I$

$2 K_{2} H g I_{4} + N H_{3} + 3 K O H \to H_{2} N . H g O . H g I + 7 K I + 2 H_{2} O$

Hence option B is correct

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