A) Both assertion and reason are true and Reason is the the correct explanation of assertion.
B) Both assertion and reason are true but reason is not the correct explanation of assertion
C) Assertion is true but Reason is false
D) Assertion is false but Reason is true

Dear student,

The water of crystallization is responsible for the colour of the salts as well as the geometric shape of the salts. 
For example- 
CuSO4.5H2O is a blue colour compound.
But CuSO4 is colourless. 

Ferrous sulphate crystals are light green in colour and this is due to the presence of 7 water molecules.

Hence, both assertion and reason are false.

Regards

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