On cooling hot zinc oxide, the yellow colour become white. Why ?

Explanation

To understand why the color of zinc oxide changes from yellow to white upon cooling, we can break down the explanation into several steps:

### Step-by-Step Solution:

1. **Understanding Zinc Oxide Composition**:
- Zinc oxide (ZnO) is composed of zinc ions (Zn²⁺) and oxide ions (O²⁻) in a 1:1 ratio.

2. **Heating Zinc Oxide**:
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