Assertion : Magnesium is extracted by the electrolysis of fused
mixture of `MgCl_(2), NaCl and CaCl_(2)`.
Reason: Calcium chloride acts as a reducing agent.

Options

A. If both assertion and reason are true and reason is the correct explanation of assertion
B. If both assertion and reason are true but reason is not the correct explanation of assertion
C. If assertion is true but reason is false
D. If both assertion and reason are false.

Explanation

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

### Step-by-Step Solution:

1. **Understanding the Assertion**:
- The assertion states that magnesium is extracted by the electrolysis of a fused mixture of `MgCl2`, `NaCl`, and `CaCl2`.
- This is true because magnesium can indeed be extracted through electrolysis of a molten mixture of these salts. The presence of `NaCl` and `CaCl2` helps in increasing the conductivity of the electrolyte and lowering the melting point of `MgCl2`, making the electrolysis process more efficient.

2. **Understanding the Reason**:
- The reason states that calcium chloride acts as a reducing agent.
- To evaluate this, we need to consider the oxidation state of calcium in `CaCl2`. Calcium has an oxidation state of +2. A reducing agent is a substance that donates electrons and gets oxidized in the process. However, since calcium is already in its highest oxidation state (+2), it cannot act as a reducing agent. Therefore, this statement is false.

3. **Conclusion**:
- Since the assertion is true and the reason is false, we can conclude that the correct answer is that the assertion is true, but the reason is false.

### Final Answer:
- Assertion: True
- Reason: False