Question

The chemical formula for plaster of paris -

• A.
• B.
• C.
• D.

Answer 1

The correct option is C

Plaster of Paris is a common mineral present in rocks. It is prepared by heating gypsum (chemically calcium sulphate dihydrate) at 373K. At this temperature gypsum loses it’s water molecules forming Plaster of Paris (calcium sulphate hemihydrates). It’s chemical formula is $CaS{O}_4.\frac{1}{2}{H}_{2}O$.