The order in which the following oxides are arranged according to decreasing basic nature is

Options

A. `Na_(2)O, MgO, Al_(2)O_(3), CuO`
B. `CuO, Al_(2)O_(3), MgO, Na_(2)O`
C. `Al_(2)O_(3) , CuO , MgO , Na_(2)O`
D. `CuO, MgO , Na_(2)O, Al_(2)O_(3)`

Answer

A

Explanation

As we move from left to right in a period the basic character of oxides of s- and p-block elements decreases while their acidic character increases. The basic character of oxides of d-block elements is lower than alkali and alkaline earth metals. Thus `Na_(2)O` is most basic followed by MgO and `Al_(2)O_(3)` while CuO is least basic.