Which one of the following statements is correct ........

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Which one of the following statements is correct?

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CAPF 2015 Paper-1

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Iron sulphate and copper sulphate crystals have same number of water of crystallization

Iron sulphate and zinc sulphate crystals have same number of water of crystallization

Zinc sulphate and copper sulphate crystals have same number of water of crystallization

Iron sulphate, copper sulphate and zinc sulphate crystals each have same number of water of crystallization

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Explanation:

Water of crystallization or water of hydration is water that occurs inside crystals.
Iron suplhate (green vitroil) – FeSO4. 7H20
Zinc Sulphate (white vitroil) – ZnSO4. 7H20
Copper suplhate (blue vitroil) – CuSO4. 5H2)
So, iron and zinc sulphate has same number of water of crystallisation that is 7.