Question

Calcium sulphate dihydrate is the chemical name of?

• A. washing soda
• B. gypsum
• C. baking powder
• D. plaster of Paris

Answer 1

Answer:

B. gypsum

Calcium sulphate dihydrate (CaSO₄·2H₂O) is commonly known as gypsum, a mineral used in plaster and construction. Plaster of Paris, on the other hand, is calcium sulphate hemihydrate (CaSO₄·½H₂O).