Question

Why is it that hydrated chlorides of Ca, Sr and Ba can be dehydrated by heating but those of Be and Mg suffer hydrolysis?

Answer 1

The mentioned metals are alkaline earth metals. The size of the metal atom plays an important role in the formation of products when heated.

The size of the metal atom is inversely related to the tendency to form halide hydrates.

In other words tendency to form alkaline earth halide hydrates gradually decreases down the group.

This favours the dehydration of those halides with bigger cation  (Ca, Sr and Ba) when heated. Smaller the cation (Be and Mg) greater is the tendency to form the halide hydrates. Hence when heated they suffer hydrolysis.

Answer 2

HEY HERE IS YOUR ANSWER...☺☺✌☺☺

The size of metal atom is INVERSLY PROPORTIONAL to the tendency to form halide hydrates.


I HOPE IT IS HELPFUL....☺✌☺