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

Options

A. `Al_2O_3 lt MgO lt Na_2O lt K_2O`
B. `MgO lt K_2O lt Al_2O_3 lt Na_2O`
C. `Na_2O lt K_2O lt MgO lt Al_2 O_3`
D. `K_2 O lt Na_2O lt Al_2O_3 lt MgO`

Answer

A

Explanation

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 `Al_2IO_3 lt MgO lt Na_2O lt K_2O`.