Chemistry - PERIODIC TABLE Question with Solution | TestHub

The thermal stability of alkaline earth metal sulfates increases down the group. This is because as the cation size increases, its polarizing power decreases, leading to a weaker distortion of the sulfate anion and stronger ionic bonds.

Order of thermal stability:

BeSO₄ < MgSO₄ < CaSO₄ < SrSO₄ < BaSO₄

Let's analyze the given options:

A. ${\mathrm{BaSO}}_4>{\mathrm{SrSO}}_4>{\mathrm{CaSO}}_4$

This order is correct as thermal stability increases down the group.

B. ${\mathrm{BaSO}}_4>{\mathrm{CaSO}}_4>{\mathrm{MgSO}}_4$

This order is also correct, following the same trend.

C. ${\mathrm{BaSO}}_4>{\mathrm{BeSO}}_4$

This order is correct as barium sulfate is more thermally stable than beryllium sulfate.

Since all the given orders are correct based on the increasing thermal stability down the group, option D is the correct answer.

The final answer is $\boxed{D}$