Which presents the correct sequence of the increasing basic nature

• Periodic Properties

Which one of the following orders presents the correct sequence of the increasing basic nature of the given oxides?

1. MgO < K₂O < Al₂O₃ < Na₂O
2. K₂O < Na₂O < Al₂O₃ < MgO
3. Na₂O < K₂O < MgO < Al₂O₃
4. Al₂O₃ < MgO < Na₂O < K₂O

Answer

As metallic character of element attached to oxygen atom increases, the difference between the electronegativity values of element and oxygen increases and thus basic character of oxides increases and vice-versa.

Hence, the increasing correct order of basic nature is

Al₂O₃ < MgO < Na₂O < K₂O

The correct option is D.