Question

Action of heat on copper sulphate crystal is a

a) Reversible process
b) physical change
c) Dehydration
d) All of the above

Answer 1

on heating, copper sulphate looses its water of crystallization ie, gets dehydrated and changes into a more powder form. On addition of water copper sulphate can regain it's blue colour and shape. So the answer will be :-
d) all of the above

Answer 2

d) All of the above
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this process can be reversed and it loses its water molecules when heated which is called dehydration and also its physical state changes like colour etc