JEE Main 2020 — Classification of Elements and Periodicity in Properties Question with Solution

Non-metal oxides are acidic in nature as they produce acidic solution by reacting with water, so here ${\mathrm{Cl}}_2\mathrm{O}, {\mathrm{P}}_4{\mathrm{O}}_{10}, {\mathrm{SO}}_3$ are acidic oxides which produce $\mathrm{HOCl}, {\mathrm{H}}_3{\mathrm{PO}}_4, {\mathrm{H}}_2{\mathrm{SO}}_4$ respectively, with water.

Alkali metal and alkaline earth metal oxides are basic in nature, as they produce metal hydroxide solution with water and metal hydroxides are basic in nature.

Here, ${\mathrm{Na}}_2\mathrm{O}, \mathrm{CaO}, {\mathrm{Li}}_2\mathrm{O}, \mathrm{MgO}$ are basic hydroxides which form $\mathrm{NaOH}, \mathrm{Ca}{\left(\mathrm{OH}\right)}_2, \mathrm{LiOH}, \mathrm{Mg}{\left(\mathrm{OH}\right)}_2$ respectively, with water.

${\mathrm{Al}}_2{\mathrm{O}}_3$ is amphoteric oxide as it can react either with acid or base to form salt and water.