If ammonium hydroxide solution is added to the aqueous solution of chromium sulphate what will form?

Greenish precipitate

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Yellow precipitate

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White turbidity

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A clear transparent yellow solution

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Solution

The correct option is D Greenish precipitate
Ammonia reacts with chromium(III) ion to precipitate gray-green chromium(III) hydroxide:
$C r^{3 +} (a q) + 3 N H 3 (a q) + 3 H_{2} O (l) \to C r (O H) 3 (s) + 3 N H_{4} + (a q)$
$C r (O H)_{3}$ dissolves only to a slight extent in excess ammonia. Boiling the solution causes the chromium(III) hydroxide to precipitate again.

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