Question

Which of the following orders is wrong?

• A. $ZnO$ is amphoteric oxide
• B. $Li<Be<B<CI{E}_1$
• C. $A{l}_2{O}_3<MgO<N{a}_{2}O<K_{2}O\text{Basic}$
• D. $L{i}^{+}<N{a}^{+}<K^{+}<C{s}^{+}\text{Ionic radius}$

Answer 1

The correct option is B $Li<Be<B<CI{E}_1$

(a) $ZnO$ is amphoteric oxide, it reacts with both $HCl$ and $NaOH$.
(b) Along the period, ionization increases but due to fully filled orbital in $Be$ , order of first ionization energy is $Li<B<Be<C$
(c) order of basic character of given oxides is $A{l}_2{O}_3<MgO<N{a}_{2}O<K_{2}O$
(d) Down the group ionic size increases, hence the order becomes $L{i}^{+}<N{a}^{+}<K^{+}<C{s}^{+}$.