Arrange the following sulphates of alkaline earth metals in order of decreasing thermal stability: BeSO_(4),MgSO_(4),CaSO_(4),SrSO_(4).

Arrange the following sulphates of alkaline earth metals in order of d

1.	Arrange the following sulphates of alkaline earth metals in order of decreasing thermal stability: BeSO_(4),MgSO_(4),CaSO_(4),SrSO_(4).
Answer» Solution :Sulphate decompose on HEATING to give the corresponding oxide. `MgSO_(4)OVERSET(Delta)(rarr)MgO+SO_(2)+(1)/(2)O_(2)` The stability increases as the electropositive character of the metal or basic nature of the metal increases down the group `(darr)`. This is clear form the INCREASING decomposition temperature down the group. `1647 K 1422 K 1168 K773 Krarr` Temperature of decomposition `SrSO_(4) gt CaSO_(4) gt MgSO_(4) gt BeSO_(4)`