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Which of the following statements regard...

Which of the following statements regarding the oxides of alkali and alkaline earth metals is correct?

A

The oxides of alkaline earth metals are more basic than those of alkali metals.

B

The reactivity of `K_(2)O` towards water is more than that of `Na_(2)O`.

C

MgO is used as a refactory material for lining electric furnances.

D

the milk of lime and lime water are two different solutions.

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