Concentrated nitric acid can be transported in vessels of iron. Why ?

Explanation

**Step-by-Step Solution:**

1. **Understanding the Nature of Iron:**
- Iron is a metal that can react with acids, but it has a unique property when it comes to concentrated nitric acid.

2. **Passive Behavior of Iron:**
- Concentrated nitric acid is known to passivate iron. This means that when iron comes into contact with concentrated nitric acid, it does not react as one might expect. Instead, it forms a protective layer.

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