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),CuP,MgO,Na_(2)O`
D. `CuO,MgO,Na_(2)O_(3)

Answer

D

Explanation

Applying Fajans' rule,the lower the charge,the more is ionic and the more is basic and vice versa.Moreover,small cation,large anion,high charge and presence of d electrons mean more covalant and more acidic. Therefore,decreasing order of basic nature is `{:(,+1,,+2,,+3,,+2),(,Na_(2)O, gt , MgO, gt,Al_(2)O_(3),gt,CuO),("Group-",1,,2,,13,,11),("Period-",3rd,,3rd,,3rd,,4th):} `