Question

Which of the following formulas are correct?

• A. Gypsum - CaSO${}_4$.2H${}_2$O
• B. White vitriol - ZnSO${}_4$.5H${}_2$O
• C. Plaster of Paris - CaSO${}_4$.1/2 H${}_2$O
• D. Blue vitriol - CuSO${}_4$.5H${}_2$O

Answer 1

Answer: (A), (C), (D)

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