Assertion : In titrations involving potassium permanganate no indicator is used.
Reason : `MnO_(4)^(-)` acts as the self-indicator.

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.

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 in titrations involving potassium permanganate (KMnO₄), no indicator is used.
- This is true because KMnO₄ itself can indicate the endpoint of the titration due to its distinct color change.

2. **Understanding the Reason**:
- The reason given is that MnO₄⁻ acts as a self-indicator.
- This is also true. Potassium permanganate has a deep purple color in its oxidized form (MnO₄⁻) and changes to a pale pink color upon reduction (when it reacts with the reducing agent).

3. **Combining the Assertion and Reason**:
- Since both the assertion and the reason are true, and the reason correctly explains why no external indicator is needed in the titration, we conclude that both statements are valid.

4. **Conclusion**:
- Therefore, the correct answer is that both the assertion and reason are true, and the reason is the correct explanation for the assertion.

### Final Answer:
Both the assertion and reason are true, and the reason is the correct explanation for the assertion.

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