Explain why, the galvanised iron article is protected against rusting even if the zinc layer is broken.

Explanation

### Step-by-Step Solution:

1. **Understanding Rusting**: Rusting is a chemical process where iron reacts with oxygen and moisture in the environment, forming hydrated iron oxide (Fe2O3·xH2O), commonly known as rust. This process weakens the iron structure.

2. **Galvanization Process**: Galvanization is the process of coating iron with a layer of zinc to protect it from rusting. Zinc is more reactive than iron and is placed higher in the reactivity series.

3. **Role of Zinc**: When iron is coated with zinc, the zinc layer acts as a sacrificial anode. This means that zinc will oxidize (corrode) preferentially to iron. Even if the zinc layer is damaged or broken, the zinc will continue to protect the underlying iron.

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