Question

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

• A. The reactivity of K2O towards water is more than that of $N{a}_{2}O$
• B. The oxides of alkaline earth metals are more basic than those of alkali metals
• C. $MgO$ is used as a refractory material for lining of electric furnaces
• D. The milk of lime and lime water are two different solutions

Answer 1

Answer: (A), (C), (D)

The correct options are
A The reactivity of K2O towards water is more than that of $N{a}_{2}O$
C $MgO$ is used as a refractory material for lining of electric furnaces
D The milk of lime and lime water are two different solutions

Milk of lime: $Ca(OH{)}_2$

Lime water is a saturated solution of $Ca\left(OH{)}_2\right(aq)$.

$MgO$: It is quite stable and fuses at 2800K hence it is used as a refractory material for lining electric furnaces.

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

So, the correct options are $A,B,C$