Question

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:

• A. FeSO4
• B. CuSO4
• C. CaSO4
• D. Na2CO3

Answer 1

Answer: (A)

FeSO4

Answer 2

FeSO$_4\cdot$7H$_2$O contains 7 water molecules**** of crystallization, the highest among the given compounds.
CuSO$_4\cdot$5H$_2$O has 5 water molecules,
while CaSO$_4$ and Na$_2$CO$_3$ have lesser or no crystallization water.