A metal salt (M) on reacting with sodium hydroxide forms sodium sulphate and a gelatinous white precipitate of a metal hydroxide. The precipitate is soluble in excess of sodium hydroxide. Identify M.

Calcium

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Magnesium

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Zinc

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Iron

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Solution

The correct option is C
Zinc

When sodium hydroxide is added to zinc sulphate, sodium sulphate is formed and zinc hydroxide is precipitated:

$Z n S O_{4} + 2 N a O H$ $\to$ $N a_{2} S O_{4} + Z n (O H)_{2}$

The gelatinous white precipitate of $Z n (O H)_{2}$ gets soluble if an excess of sodium hydroxide is added.

$Z n (O H)_{2} + 2 N a O H (e x c e s s)$ $\to$ $N a_{2} Z n O_{2} (a q) + H_{2} O$

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Zinc nitrate reacts with ammonium hydroxide to give a white gelatinous precipitate of X which is soluble in excess of ammonium hydroxide. What is X?

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