Q.

The solubility of alkali metal hydroxide follows the order

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a

LiOH < NaOH < KOH < RbOH < CsOH

b

LiOH > CsOH > RbOH > NaOH > KOH

c

none of these

d

LiOH > NaOH > KOH > RbOH > CsOH

answer is A.

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Detailed Solution

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Lattice energy and hydration energy both decreases down the group. Decrease in lattice energy is more than decrease in hydration enthalpy thus solubility of alkali metal hydroxides increases down the group.

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