Question

Identify the correct statement.

• A. Gypsum contains a lower percentage of calcium than Plaster of Paris
• B. Gypsum is obtained by heating Plaster of Paris
• C. Plaster of Paris is obtained by hydration of gypsum
• D. Plaster of Paris is obtained by partial oxidation of gypsum

Answer 1

Answer: (A)

Gypsum contains a lower percentage of calcium than Plaster of Paris

Answer 2

2[CaSO4.2H2O]$\longrightarrow$2CaSO4.H2O (calcium sulphate hemihydrate) + 3H2O

Gypsum Plaster of Paris