Consider the following compounds: FeSO4 ; CuSO4 ; CaSO4 ; Na2CO3 The compound having the maximum number of water of crystallisation in its crystalline form in one molecule is:
FeSO\(_4\cdot\)7H\(_2\)O contains 7 water moleculesof crystallization, the highest among the given compounds. CuSO\(_4\cdot\)5H\(_2\)O has 5 water molecules, while CaSO\(_4\) and Na\(_2\)CO\(_3\) have lesser or no crystallization water.