Question

Which of the following hydroxide is most basic ?
(a) Mg (OH) 2 (b) Ba (OH) 2 (c) Ca(OH) 2 (d) Be (OH) 2

Answer 1

D.) Be(OH)$:-Be(OH)_{2}$

basic character of hydroxide of grp. 2 elements inc. on moving down the group.

Answer 2

(b) $Ba(OH)_2$ is more basic hydroxide from the given option.

Here all the given hydroxides are from the group-2. These metals are also called as Alkaline earth metal. As we go down in the group, the basic nature of hydroxide increases down in the group .

Hence, $Ba(OH)_2$ must be most basic. This is because as we move down, the metallic nature of element increases and metals form basic hydroxides therefore down in the group the basic nature of hydroxide increases.