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.

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Solution

When sodium hydroxide is added to zinc sulphate, sodium sulphate is formed and zinc hydroxide is precipitated:
$Z n S O_{4} + N a O H \to 2 N a_{2} S O_{4} + Z n (O H)_{2}$

The gelatinous white precipitate of $Z n (O H)_{2}$ gets soluble if an excess of sodium hydroxide is added.
$Z n S O_{4} + 2 N a O H (e x c e s s) \to N a_{2} Z n O_{2} + H_{2} O$

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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.

When sodium hydroxide is added to zinc sulphate, sodium sulphate is formed and zinc hydroxide is precipitated: ZnSO4+NaOH→2Na2SO4+Zn(OH)2 The gelatinous white precipitate of Zn(OH)2 gets soluble if an excess of sodium hydroxide is added. ZnSO4+2NaOH(excess)→Na2ZnO2+H2O