Name the chief ore of Aluminium and the process of concentration of the ore.

Explanation

### Step-by-Step Solution:

1. **Identify the Chief Ore of Aluminium**:
- The chief ore of aluminium is **Bauxite**.
- Chemical formula: **Al₂O₃·2H₂O**.

2. **Understand the Composition of Bauxite**:
- Bauxite contains about **40% alumina** (Al₂O₃) and is found in a combined state, primarily as an oxide.
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