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In the titration of oxalic acid against KMnO4, which species acts as the self-indicator?

1. KMnO4
2. oxalic acid
3. K2SO4
4. MnSO4

Correct answer: KMnO4

Solution

KMnO4 is deeply purple and gets decolourised while reacting; the first persistent pink tinge marks the end point, so it serves as its own indicator.

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