What is the generic name of calcium sulphate hemihydrate?

Plaster of Paris

The correct answer is option 2. Plaster of Paris.

The generic name of calcium sulfate hemihydrate is Plaster of Paris. 

Plaster of Paris is a common name for calcium sulfate hemihydrate. It is a white powder that, when mixed with water, forms a paste that hardens quickly. Plaster of Paris is widely used in construction, art, and medical applications, such as casting molds and setting broken bones.