Chemical And Ionic Equilibrium Result Question 22
22. Amongst the following hydroxides, the one which has the lowest value of $K _{\text {sp }}$ at ordinary temperature (about $25^{\circ} \mathrm{C}$ ) is
(1990,1 M)
(a) $\mathrm{Mg}(\mathrm{OH}) _2$
(b) $\mathrm{Ca}(\mathrm{OH}) _2$
(c) $\mathrm{Ba}(\mathrm{OH}) _2$
(d) $\mathrm{Be}(\mathrm{OH}) _2$
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Answer:
Correct Answer: 22. ( d )
Solution:
- In case of hydroxides of Group II A, solubility increases down the group. Therefore, $\mathrm{Be}(\mathrm{OH}) _2$ is least soluble, has lowest value of $K _{\text {sp }}$.
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