The oxides of alkali and alkali earth metals are basic and the their strenght increases down the group. The solubility of carbonates and sulphates of alkali and earth metals shown opposite trends. Only the carbonates of Li and alkaline earth metals decompose on heating. The bicarbonates of both alkali and alkali earth metals on heating give carbonatesThe correct decreasing order of basic character of the oxides is

The oxides of alkali and alkali earth metals are basic and the their s

1.	The oxides of alkali and alkali earth metals are basic and the their strenght increases down the group. The solubility of carbonates and sulphates of alkali and earth metals shown opposite trends. Only the carbonates of Li and alkaline earth metals decompose on heating. The bicarbonates of both alkali and alkali earth metals on heating give carbonatesThe correct decreasing order of basic character of the oxides is
Answer» `K_(2)OgtMgOgtSrOgtCs_(2)O` `Cs_(2)OgtK_(2)OgtSrOgtMgO` `MgOgtSrOgtK_(2)OgtCs_(2)O` `Cs_(2)OgtK_(2)OgtMgOgtSrO` Solution :As electropositive character of METAL in metal OXIDE INCREASES basic character increases