JEE Main Chemistry question

Alkaline earth metal compounds are less soluble in water than corresponding alkali metal compounds because former have:

(A)Lower lattice energy
(B)Higher I.P.
(C)Higher covalent characterCorrect
(D)Lower covalent character

Answer: (C)

Solution

The divalent, more highly charged and often smaller alkaline earth cations polarise anions more strongly than singly-charged alkali metal cations of comparable size, giving alkaline earth compounds greater covalent character (by Fajans' rule), which tends to reduce their water solubility relative to the

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Question ID VK-137966