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Chemical Properties of Ammonia

The sample is...

Question

The sample is dissolved in hot con. $H C l$ and add few drops of $N H_{4} O H$ , then acidified with dil. Acetic acid + few drops of potassium ferrocyanide solution. The precipitate is obtained. Guess the color of precipitate.

A

Red

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B

Blue

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C

White

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D

Chocolate brown

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Solution

The correct option is D Chocolate brown
Potassium ferrocyanide precipitates brown coloured copper(II) ferrocyanide from Cu²⁺ solutions. The equation can be written as:
$C u^{2 +} + [F e (C N)_{6}]^{4 -} \to C u_{2} [F e (C N)_{6}] (s))$

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