Assertion :White precipitate of $M g (O H)_{2}$ is insoluble in excess of sodium hydroxide but readly soluble in solution of ammonium salts. Reason: $M g (O H)_{2}$ is very sparingly soluble in water.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is incorrect but Reason is correct

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Both Assertion and Reason are correct

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Solution

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
Magnesium sulphate reacts with disodium hydrogen phosphate in presence of ammonium hydroxide, a insoluble white crystalline precipitate of magnesium ammonium phosphate is formed.
$M g S O_{4} + N a_{2} H P O_{4} + N H_{4} O H \to M g (N H_{4}) P O_{4} ↓ (white ppt) + N a_{2} S O_{4} + H_{2} O$
Thus both assertion reasons are correct and reaction is the correct explanation for assertion.

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