Which of the following oxides is highly basic?

Which of the following oxides is highly basic?
  1. $\mathrm{Cr}_2 \mathrm{O}_3$
  2. $\mathrm{Al}_2 \mathrm{O}_3$
  3. $\mathrm{MgO}$
  4. $\mathrm{Na}_2 \mathrm{O}$

Solution

Strongly electro positive metals form strongly basic oxides that dissolve in water to give alkalis. $\mathrm{Na}_2 \mathrm{O}$ has strongly electro positive $\mathrm{Na}$-metal that forms $\mathrm{NaOH}$ in water which is a strong base.

Asked in: AP EAMCET 2023 (16 May Shift 1)

Practice more Classification of Elements and Periodicity in Properties questions on Aicharya