Which of the following statement regarding the oxides of alkali and alkaline metals is correct? ...

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Which of the following statement regarding the oxides of alkali and alkaline metals is correct?
(a) The reactivity of \( \mathrm{K}_{2} \mathrm{O} \) towards water is more than that of \( 2 \mathrm{NaO} \).
(b) The oxides of alkaline earth metals are more basic than those of alkali metals.
(c) \( \mathrm{MgO} \) is used as a refractory material for lining of electric furnace.
(d) The milk of lime and lime water are two different solutions.
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