A metal hydroxide is precipitated as a white gelatinous substance when $N H_{4} O H$ is added to the solution (after previously removing acid insoluble sulphides with $H_{2} S$ ). The metal in metal hydroxide is :

C r

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F e

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A l

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Z n

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Solution

The correct option is D $A l$
$A l^{3 +} + 3 O H^{-} \to A l (O H)_{3} ↓ W h i t e p p t$

An excess of regent dissolves the precipitate forming tetrahydroxoaluminate
$A l (O H)_{3} + 3 O H^{-} \to [A l (O H)_{4}]^{-}$

Addition of $N H_{4} O H$ further gives gelatinoius white ppt. of Aluminum hydroxide.
$[A l (O H)_{4}]^{-} + N H_{4}^{+} \to A l (O H)_{3} ↓ + N H_{3} ↑ + H_{2} O$

Option C is correct.

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A metal hydroxide is precipitated as a white gelatinous substance when NH4OH is added to the solution (after previously removing acid insoluble sulphides with H2S). The metal in metal hydroxide is :

A metal hydroxide is precipitated as a white gelatinous substance when $N H_{4} O H$ is added to the solution (after previously removing acid insoluble sulphides with $H_{2} S$ ). The metal in metal hydroxide is :