Epsom salt is

Options

A. `CuSO_4 , 5H_2 O `
B. `CaSO_4 . 2H_2 O `
C. `MgSO_4 . 7H_2 O `
D. `Na_2 SO_4 . 10 H_2 O `

Answer

### Step-by-Step Solution:

1. **Identify Epsom Salt**: Epsom salt is commonly known as a compound that is used in various applications, including gardening, health, and beauty.

2. **Chemical Name**: The chemical name of Epsom salt is Hydrated Magnesium Sulphate.

3. **Basic Formula**: The basic formula for Magnesium Sulphate is MgSO4.

4. **Hydration**: Since Epsom salt is hydrated, it contains water molecules in its structure. The number of water molecules associated with it is 7.

5. **Complete Chemical Formula**: Therefore, the complete chemical formula for Epsom salt is MgSO4·7H2O. This indicates that for every one molecule of Magnesium Sulphate, there are seven molecules of water.

6. **Conclusion**: Thus, the correct option for the molecular formula of Epsom salt is MgSO4·7H2O.