In iodometric titration which indicator is used to detect end point of titration reaction?

Options

A. Diphenylamine
B. Starch
C. `MnO_4^⊖`
D. Methyl orange

Answer

**Step-by-Step Solution:**

1. **Understanding Iodometric Titration**:
- Iodometric titration is a type of redox titration that involves iodine. In this process, iodine is released during the reaction, which is essential for the titration.

2. **Role of Indicator**:
- An indicator is a substance that changes color at a certain pH level or in response to a specific chemical change. In iodometric titration, the indicator helps to identify the endpoint of the titration.

3. **Identifying the Indicator**:
- In iodometric titration, starch solution is commonly used as an indicator. Starch forms a complex with iodine, resulting in a blue color.

4. **Endpoint Detection**:
- As the titration progresses and iodine is consumed, the blue color will disappear when all the iodine has reacted. The endpoint is reached when the blue color fades, indicating that the reaction is complete.

5. **Conclusion**:
- Therefore, the indicator used to detect the endpoint of iodometric titration is starch.

**Final Answer**: Starch is the indicator used in iodometric titration to detect the endpoint of the titration reaction.

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