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JEE Main levelOne or more correct optionsDifficulty 2 of 3sb041

Which of the following statements about the alkaline earth metals and their compounds are correct?

A $Mg (OH) X_{2}$ is a stronger base than $Ba (OH) X_{2}$ .
B $Be (OH) X_{2}$ is amphoteric.
C $BeCl X_{2}$ is largely covalent while $MgCl X_{2}$ is largely ionic.
D $BaCO X_{3}$ is more stable to heat than $CaCO X_{3}$ .

Answer: B, C, D

Be (OH) X_{2}

dissolves in both acid and excess alkali. Carbonate stability rises down the group, and the high polarising power of

Be X^{2 +}

makes

BeCl X_{2}

covalent. The basic strength of the hydroxides rises down the group, so

Ba (OH) X_{2}

is stronger than

Mg (OH) X_{2}

and the last statement is wrong.

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