Which of the following is not the ore of aluminium?

Options

A. Bauxite
B. Diaspore
C. Limonite
D. Kaolinite

Explanation

To determine which of the following is not an ore of aluminum, we can analyze the given options based on their chemical compositions and the metals they are associated with.

### Step-by-Step Solution:

1. **Understand the Definition of an Ore**:
- An ore is a naturally occurring mineral from which a metal can be extracted profitably.

2. **Identify Common Ores of Aluminum**:
- The most common ore of aluminum is **Bauxite**, which has the formula **Al2O3·2H2O**. This indicates that it contains aluminum.
- Another ore is **Diospore**, which has the formula **Al2O3·H2O** (single hydrated aluminum oxide), also indicating the presence of aluminum.
- **Paulineite** has the formula **Al2O3·2SiO2·2H2O**, which also contains aluminum.

3. **Analyze the Given Options**:
- If we consider **Limonite**, its formula is **FeO(OH)·nH2O**. This indicates that it is primarily composed of iron and is not associated with aluminum.

4. **Conclusion**:
- Based on the analysis, **Limonite** is not an ore of aluminum; it is an ore of iron.

### Final Answer:
Limonite is not an ore of aluminum.