s-Block ElementsHard

Question

Which one of the following hydroxide is insoluble water ?

Options

A.Ca(OH)2
B.Ba(OH)2
C.Be(OH)2
D.Mg(OH)2

Solution

In hydroxides of alkaline earth metals, hydration energy does not alter very much whilelattice energy decreases down the group due to increases down the group due to increasedown the group due to increase in size.
The overall effects of the two factors is that ᐃH solution of the hydroxides
(ᐃH solution = ᐃHlattice - ᐃHhydration)
becomes more negative from Be to Baand hance solubility increasefrom top to bottom.
Be(OH)2< Mg(OH)2 < Ca(OH)2 < Sr(OH)2 < Ba(OH)2

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