Give reasons for the following:
a. Anhydrous calcium sulphate (anhydrite) cannot be used as plaster of Paris.

Explanation

To answer the question regarding why anhydrous calcium sulfate (anhydrite) cannot be used as plaster of Paris, we can break down the explanation into clear steps:

### Step-by-Step Solution:

1. **Understanding Anhydrous Calcium Sulfate**:
- Anhydrous calcium sulfate is represented by the chemical formula \( \text{CaSO}_4 \). It is a dry form of calcium sulfate that does not contain any water molecules.

2. **Understanding Plaster of Paris**:
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