Question

The chemical substance used as a cast for setting broken bones in surgery is:

• A. Washing soda
• B. Plaster of Paris
• C. Quicklime
• D. Gypsum \bigskip

Hint:

Plaster of Paris (POP) is commonly used in orthopedic applications, moldings, and sculptures due to its quick-setting nature.

Answer 1

The Correct Option is B

Plaster of Paris (POP) is chemically calcium sulfate hemihydrate (CaSO$_4$·$\frac{1}{2}$H$_2$O). When mixed with water, it forms a paste that hardens as it dries, making it ideal for use as a cast in medical applications to immobilize broken bones.