Assertion : Zinc is used in the galvanisation of iron.
Reason : Its coating on iron articles increases their life by protecting iron from rusting.

Options

A. If both assertion and reason are true and reason is the correct explanation of assertion.
B. IF both assertion and reason are true but reason is not the correct explanation of assertion.
C. If assertion is true but reason is false.
D. If both assertion and reason are false.

Explanation

**Step-by-Step Solution:**

1. **Understanding the Assertion:**
- The assertion states that zinc is used in the galvanization of iron.
- Galvanization is a process where a protective layer of zinc is applied to iron to prevent rusting.

2. **Understanding the Reason:**
- The reason provided is that the coating of zinc on iron articles increases their lifespan by protecting them from rusting.
- Rusting occurs when iron reacts with oxygen and moisture in the air, forming iron oxide (rust), which degrades the metal.

3. **Explaining Rusting:**
- Iron is a reactive metal and readily reacts with oxygen and moisture, leading to the formation of rust, which is a reddish-brown oxide.
- Rusting affects the physical properties of iron, such as strength and appearance, making it less useful.

4. **The Process of Galvanization:**
- In galvanization, a layer of zinc is applied to the surface of iron.
- When exposed to air, the zinc layer corrodes preferentially instead of the iron, thus protecting the iron from rusting.

5. **Conclusion:**
- Both the assertion and the reason are true.
- The reason correctly explains why zinc is used in the galvanization of iron, as it effectively prevents rusting and increases the lifespan of iron articles.

**Final Answer:**
- The assertion is true, the reason is true, and the reason is a correct explanation of the assertion.

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