Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R. Assertion A : LiF is sparingly soluble in water. Reason R : The ionic radius of Li ion is smalles

Question

Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R. Assertion A : LiF is sparingly soluble in water. Reason R : The ionic radius of Li ion is smallest among its group members, hence has least hydration enthalpy. In the light of the above statements, choose the most appropriate answer from the options given below . + + – +

(A) Both A and R are true and R is the correct explanation of A
(B) Both A and R are true but R is NOT the correct explanation of A
(C) A is true but R is false
(D) A is false but R is true

Prashant Kotian · Accepted Answer

Correct answer: C) A IS TRUE BUT R IS FALSE. LiF is sparingly soluble in water. The low solubility of LiF in water is due to its high lattice enthalpy (Since Li and F are small in size). Also, due to the small size of Li , its hydration enthalpy is high. Hence, the assertion is true but the reason is false.

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