Magnetization of iron is a `"_____"` change . (physical chemical).

Explanation

**Step-by-Step Solution:**

1. **Understanding Magnetization**: Magnetization refers to the process of making a material, such as iron, magnetic. This can occur when iron is placed in a magnetic field.

2. **Identifying the Type of Change**: To determine whether magnetization is a physical or chemical change, we need to understand the definitions of both:
- A **physical change** is a change that does not alter the chemical composition of a substance. The substance remains the same, even if its form or appearance changes.
- A **chemical change**, on the other hand, involves a transformation that results in the formation of one or more new substances with different chemical properties.

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