Name an indicator which can act as self-indicator.

Answer

**Step-by-Step Solution:**

1. **Understanding the Question:**
The question asks for an indicator that can act as a self-indicator. A self-indicator is a substance that can indicate the endpoint of a titration without the need for an additional external indicator.

2. **Identifying a Suitable Self-Indicator:**
One well-known self-indicator is Potassium Permanganate (KMnO4).

3. **Explaining Why KMnO4 is a Self-Indicator:**
- When KMnO4 is used in titrations, particularly with reducing agents like oxalic acid, it undergoes a color change.
- In its oxidized state, KMnO4 is purple in color. As it reacts with the reducing agent, it is reduced and becomes colorless.
- The disappearance of the purple color indicates that the endpoint of the titration has been reached.

4. **Conclusion:**
Therefore, Potassium Permanganate (KMnO4) is an example of an indicator that acts as a self-indicator because it changes color during the titration process, signaling the endpoint without requiring an additional indicator.

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