Question

The increasing order of the basic character of oxides $MgO,SrO,K_{2}O$ and $C{s}_{2}O$ is:

• A. $MgO<SrO<K_{2}O<C{s}_{2}O$
• B. $SrO<MgO<C{s}_{2}O<K_{2}O$
• C. $C{s}_{2}O<K_{2}O<SrO<MgO$
• D. $K_{2}O<C{s}_{2}O<SrO<MgO$

Answer 1

The correct option is A $MgO<SrO<K_{2}O<C{s}_{2}O$

on going down the group in alkaline earth metals and alkali metals, as the atomic size increases, the reactivity increases. Hence on going down the group, the basic character of oxides also increases:

$MgO<SrO<K_{2}O<C{s}_{2}O$