Question

Which one is the least basic?

• A. $BeO$
• B. $MgO$
• C. $CaO$
• D. $BaO$

Answer 1

The correct option is A

$\mathrm{BeO}$

The chemical property of the elements in the same group are the same but the nature of oxide differs

Explanation for the correct option:

The basic nature of metal oxides rises from top to bottom in a group.

So, Beryllium oxide ($\mathrm{BeO}$) is least basic.

Explanation for the incorrect option:

Barium oxide ($\mathrm{BaO}$), Calcium oxide ($\mathrm{CaO}$) and Magnesium oxide ($\mathrm{MgO}$) are more basic than Beryllium oxide.

Final answer:

Hence, option (A) is the correct option.