Mark the correct sequence in decreasing order of solubility in water:

$K C l, K B r, K I$

K I > K B r > K C l

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K C l > K I > K B r

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K I > K C l > K B r

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K C l > K B r > K I

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Solution

The correct option is A $K I > K B r > K C l$
In the given alkali metal hydrides, the cation is the same (potassium) and the anion is different. The lattice energy is inversely proportional to the size of the oppositely charged ion (anion).

The decreasing order of size is $I^{-} > B r^{-} > C l^{-}$ . Hence, the increasing order of lattice energy is $K I < K B r < K C l$ .

The solubility of a compound is inversely proportional to its lattice energy.

Hence, the increasing order of solubility is $K I > K B r > K C l$ .

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