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Question

Sulphate of a metal ‘M’ (having amphoteric oxide) reacts with sodium hydroxide to form a white gelatinous precipitate. The chemical formula of the precipitate and metal ‘M’ respectively are

A
Cu(OH)2 and Cu
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B
Na2ZnO2 and Zn
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C
CuO and Cu
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D
Zn(OH)2 and Zn
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Solution

The correct option is D Zn(OH)2 and Zn
The metal ‘M’ is zinc (Zn) as it has an amphoteric oxide, ZnO.

Zinc sulphate (ZnSO4) reacts with sodium hydroxide (NaOH) to form a white gelatinous precipitate of zinc hydroxide (Zn(OH)2) along with sodium sulphate (Na2SO4). The chemical reaction between ZnSO4 and NaOH is as given below:

ZnSO4+2NaOHZn(OH)2+Na2SO4

Hence, the correct answer is option (d).

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