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Question

Which of the following is/are correct regarding redox titrations?

A
In titrations using potassium dichromate, K2Cr2O7 is used as a self-indicator.
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B
In titrations using potassium dichromate, external indicators like, diphenylamine are used.
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C
In titrations using potassium permangante, KMnO4 is used as a self-indicator.
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D
In titrations using potassium permangante, external indicators like, diphenylamine are used.
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Solution

The correct option is C In titrations using potassium permangante, KMnO4 is used as a self-indicator.
In the redox titrations using potassium permanganate, KMnO4 serves as a self-indicator.
Potassium permanganate(KMnO4) is dark purple in nature. After the titration in acidic medium, it changes the color to pale pink due to the formation of Mn2+ at the end point. Since the function of the indicator is to detect end points, a separate indicator for permanganate titration is not needed. Thus KMnO4 act as a self-indicator.

In redox titrations using potassium dichromate, external indicators like, diphenylamine, potassium ferricyanide etc. are used.

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