Which of the following, on thermal decomposition, form both acidic and basic oxides along with…
Which of the following, on thermal decomposition, form both acidic and basic oxides along with $\mathrm{O}_2$ ?
(i) $\mathrm{NaNO}_3$ (ii) $\mathrm{Ca}\left(\mathrm{NO}_3\right)_2$ (iii) $\mathrm{Be}\left(\mathrm{NO}_3\right)_2$ (iv) $\mathrm{LiNO}_3$ The correct option is
ii, iii only
iii, iv only
ii, iv only
$\mathrm{i}, \mathrm{ii}$, iii
Solution
$2 \mathrm{NaNO}_2 \longrightarrow \underset{\text { (basic) }}{2 \mathrm{NaNO}_2}+\mathrm{O}_2$
$4 \mathrm{LiNO}_3 \longrightarrow \underset{\text { (basic) }}{2 \mathrm{Li}_2 \mathrm{O}}+\underset{\text { (acidic) }}{4 \mathrm{NO}_2}+\mathrm{O}_2$
$4 \mathrm{Be}\left(\mathrm{NO}_3\right)_2 \longrightarrow \underset{\text { (basic) }}{\left[\mathrm{Be}_4 \mathrm{O}\left(\mathrm{NO}_3\right)_6\right]+\mathrm{N}_2+\frac{5}{2} \mathrm{O}_2}$
$2 \mathrm{Ca}\left(\mathrm{NO}_3\right)_2 \longrightarrow \underset{\text { (basic) }}{2 \mathrm{CaO}(\mathrm{s})}+\underset{\text { (acidic) }}{4 \mathrm{NO}_2(\mathrm{~g})}+\mathrm{O}_2$
$\mathrm{So}, \mathrm{Ca}\left(\mathrm{NO}_3\right)_2$ and $\mathrm{LiNO}_3$ give both acidic and basic oxide along with $\mathrm{O}_2$.