Which of the following formulas are correct?

Gypsum - CaSO $_{4}$ .2H $_{2}$ O

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White vitriol - ZnSO $_{4}$ .5H $_{2}$ O

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Plaster of Paris - CaSO $_{4}$ .1/2 H $_{2}$ O

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Blue vitriol - CuSO $_{4}$ .5H $_{2}$ O

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Solution

The correct options are
A
Gypsum - CaSO $_{4}$ .2H $_{2}$ O

C
Plaster of Paris - CaSO $_{4}$ .1/2 H $_{2}$ O

D
Blue vitriol - CuSO $_{4}$ .5H $_{2}$ O

All of the above are salts, containing water of crystallisation.

and the correct formula for White vitriol is -

ZnSO $_{4}$ .7H $_{2}$ O

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