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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3sb146

Select the correct statement(s) about the hydroxides of Group 2 elements.

A $Ca (OH) X_{2}$ is more soluble in water than $Ba (OH) X_{2}$ at 298 K.
B $Mg (OH) X_{2}$ is a weaker base than $Ca (OH) X_{2}$ .
C $Be (OH) X_{2}$ is amphoteric.
D $Mg (OH) X_{2}$ dissolves in excess aqueous NaOH to give $[Mg (OH) X_{4}] X^{2 -}$ .

Answer: B, C

Basic strength and solubility of the hydroxides both rise down the group, so

Mg (OH) X_{2}

is weaker than

Ca (OH) X_{2}

, and

Ba (OH) X_{2}

is more soluble than

Ca (OH) X_{2}

. Only

Be (OH) X_{2}

is amphoteric and dissolves in alkali;

Mg (OH) X_{2}

does not. The first two statements are correct.

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