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Among the following hydroxides, the one which has the lowest value of Ks (solubility product) at ordinary temperature is:

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Among the following hydroxides, the one which has the lowest value of Ks (solubility product) at ordinary temperature is:

(a) Mg(OH)2
(b) Ca(OH)2
(c) Ba(OH)2
(d) Be(OH)2

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(d) Be(OH)2

The solubility increases down the group due to an increase in the size of the ion and a decrease in lattice energy. Lower the solubility, lower is the Ks.

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