JEE Main Chemistry question

Not in JEE Main or NEET syllabus

The solubility of alkali metal hydroxide is [OJEE 2007]

(A)LiOH<KOH<NaOH<RbOH<CsOH
(B)LiOH<NaOH<KOH<RbOH<CsOHCorrect
(C)CsOH<RbOH<KOH<NaOH<LiOH
(D)None of the above

Answer: (B)

Solution

Solubility of alkali metal hydroxides increases steadily down the group as lattice energy falls off faster than hydration energy with increasing cationic size. This gives the order

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Question ID VK-137541