A: Aluminium metal is used as a reducing agent for the extraction of metals
R: Aluminium has great affinity for oxygen

Options

A. If both Assertion & Reason are true and the reason is the correct explanation of the assertion, then mark (1).
B. If both Assertion & Reason are true but the reason is not the correct explanation of the assertion, then mark (2)
C. If Assertion is true statement but Reason is false, then mark
D. If both Assertion and Reason are false statements, then mark (4)

Answer

To solve the question, we need to analyze both the assertion and the reason provided.

### Step-by-Step Solution:

1. **Understanding the Assertion**:
- The assertion states that "Aluminium metal is used as a reducing agent for the extraction of metals."
- A reducing agent is a substance that donates electrons to another substance, thereby reducing it. In the context of metal extraction, this means that aluminium can help extract metals from their ores by removing oxygen.

2. **Understanding the Reason**:
- The reason states that "Aluminium has great affinity for oxygen."
- Affinity for oxygen means that aluminium readily reacts with oxygen, forming aluminium oxide. This property allows aluminium to effectively remove oxygen from metal oxides.

3. **Connecting Assertion and Reason**:
- Since aluminium has a strong tendency to bond with oxygen, it can reduce metal oxides by removing the oxygen. For example, in the reaction with chromium oxide (CrO3), aluminium can reduce it to chromium metal and form aluminium oxide (Al2O3) in the process.
- This demonstrates that aluminium acts as a reducing agent due to its high affinity for oxygen.

4. **Conclusion**:
- Both the assertion and the reason are true. The reason correctly explains why aluminium is used as a reducing agent in the extraction of metals.

5. **Final Answer**:
- Therefore, the correct option is that both the assertion and reason are true, and the reason is the correct explanation for the assertion.