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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3sb148

Select the correct statement(s).

A $MgO$ is more basic than $BeO$ .
BHeating $CaO$ with carbon at high temperature in an electric furnace gives $CaC X_{2}$ .
C $BeO$ dissolves in aqueous NaOH to give a beryllate.
D $BaO$ combines with oxygen at about 773 K to give $BaO X_{2}$ .

Answer: A, B, C, D

BeO

is amphoteric:

BeO + 2 NaOH + H X_{2} O Na X_{2} [Be (OH) X_{4}]

.

2 BaO + O X_{2} 2 BaO X_{2}

occurs on heating, and

CaO + 3 C CaC X_{2} + CO

is the carbide route. Basic character increases down the group, so

MgO

is more basic than

BeO

; all four are correct.

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