Give reasons for the following:
Iron sheets are galvanized before use.

Explanation

**Step-by-Step Solution:**

1. **Understanding Galvanization**: Galvanization is the process of applying a protective zinc coating to iron or steel to prevent rusting.

2. **Reason for Galvanization**: Iron sheets are galvanized before use primarily to prevent corrosion. Iron is prone to rusting when exposed to moisture and air, leading to deterioration of the metal.

3. **Role of Zinc**: The zinc coating acts as a barrier between the iron and the environment. It prevents moisture and oxygen from reaching the iron surface, which are necessary for the rusting process.

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