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Assertion : White precipitate of Mg(OH)2 is insoluble in excess of sodium hydroxide but readily soluble in solution of ammonium salts. 

Reason : Mg(OH)2 is very sparingly soluble in water.

Hint : In presence of ammonium salts the reaction proceeds in backward direction forming ammonia gas.

(A) Both Assertion and Reason are true and Reason is the correct explanation of Assertion. 

(B) Both Assertion and Reason are true but Reason is not correct explanation of Assertion 

(C) Assertion is true but Reason is false 

(D) Assertion is false but Reason is true

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(B) Both Assertion and Reason are true but Reason is not correct explanation of Assertion.

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