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Zinc Ion

An aqueous so...

Question

An aqueous solution of colourless metal sulphate $M$ , gives a white ppt. with $N H_{4} O H$ . This was soluble in excess of $N H_{4} O H$ . On passing $H_{2} S$ through this solution a white ppt. is formed. The metal $M$ in the salt is?

C a

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B a

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A l

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Z n

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Solution

The correct option is D $Z n$
The metal M in the salt is zinc.
An aqueous solution of colourless zinc sulphate , gives a white ppt. of $Z n (O H)_{2}$ with $N H_{4} O H$ .
$Z n S O_{4} + 2 N H_{4} O H \to Z n (O H)_{2} ↓ + (N H_{4})_{2} S O_{4}$
This was soluble in excess of $N H_{4} O H$ to form ammonium zincate $(N H_{4})_{2} Z n O_{2}$ .
$Z n (O H)_{2} + 2 N H_{4} O H \to (N H_{4})_{2} Z n O_{2} + 2 H_{2} O$
On passing $H_{2} S$ through this solution a white ppt. of ZnS is formed.
$(N H_{4})_{2} Z n O_{2} + H_{2} S \to Z n S ↓ + 2 N H_{4} O H$

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