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In the titration of oxalic acid against KMnO4, which species acts as the self-indicator?
- KMnO4
- oxalic acid
- K2SO4
- 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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