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NEET levelSingle correct optionDifficulty 1 of 3sb059

Which of the following hydroxides dissolves both in dilute hydrochloric acid and in excess aqueous sodium hydroxide?

A $Be (OH) X_{2}$
B $Mg (OH) X_{2}$
C $Ba (OH) X_{2}$
D $Ca (OH) X_{2}$

Answer: A

Be (OH) X_{2}

is amphoteric: with acid it gives

Be X^{2 +}

and with excess base it gives

[Be (OH) X_{4}] X^{2 -}

. The hydroxides of Mg, Ca and Ba are basic only.

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