Galvanisation of iron denotes coating with ______

Explanation

**Step-by-Step Solution:**

1. **Understanding Galvanization**: Galvanization is a process used to protect iron and steel from rusting. It involves applying a protective layer to the metal surface.

2. **Identifying the Coating Material**: The protective coating used in galvanization is specifically zinc. This is because zinc has properties that prevent corrosion and rust formation on iron.

3. **Function of Zinc Coating**: The zinc coating serves as a barrier that prevents moisture and corrosive substances from reaching the iron underneath. Additionally, zinc acts as a sacrificial anode, meaning that if the coating is scratched or damaged, the exposed iron will still be protected by the remaining zinc.

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