JEE Main · ChemistryHard

$Which of the following statements regarding the solubility and hydration of alkali metal salts is correct?$

A. $Li^{+} salts are generally more soluble in organic solvents than other alkali metal salts due to high covalent character.$
B. $The hydration enthalpy of alkali metal ions increases down the group from Li^{+} to Cs^{+} .$
C. $All alkali metal carbonates are highly soluble in water, and their solubility decreases down the group.$
D. $The lattice energy of alkali metal halides increases down the group as the ionic radius increases.$

Show correct answer & step-by-step solution

Correct answer: A — $Li^{+} salts are generally more soluble in organic solvents than other alkali metal salts due to high covalent character.$

Solution

$The small size of the Li^{+} ion results in high polarizing power according to Fajan's rule.$
$This high polarizing power induces significant covalent character in lithium salts.$
$Covalent compounds exhibit higher solubility in non-polar organic solvents compared to ionic compounds.$
$Hence the answer is (A).$

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