Which one of the following order represents the correct sequence of the increasing basic nature of the given oxides?

Options

A. `MgO lt K_(2)O lt Al_(2) O_(3) lt Na_(2)O`
B. `Na_(2)O lt K_(2)O lt MgO lt Al_(2)O_(3)`
C. `K_(2)O lt Na_(2)O lt Al_(2)O_(3) lt MgO`
D. `Al_(2)O_(3) lt MgO lt Na_(2)O lt K_(2)O`

Answer

A

Explanation

Metallic character decreases across a period in the sequence as Na , Mg , Al and increases down the group in the sequence as Na , K . As metallic character of the element attached to oxygen atom increases, the basic character of oxides increases .
Hence , the increasing correct order of basic nature is `Al_(2)O_(3) lt MgO lt Na_(2)O lt K_(2)O`.