Assertion :Teacher demonstrated that $(C_{2} O_{4}^{2 -})$ oxalate ion decolourised $M n O_{4}^{-} / H^{+}$ (white) and these precipitate also decolourised $M n O_{4}^{-} / H^{+}$ . While performing salt analysis quickly, a student performed this experiment without precipitation of $C_{2} O_{4}^{2 -}$ but salt given to him confirmed $M n O_{4}^{-} / H^{+}$ test. He reported $C_{2} O_{4}^{2 -}$ is oxidized by permanganate. Reason: Presence of $F e^{2 +}$ in mixture also gave positive $M n O_{4}^{-} / H^{+}$ test.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Potassium permanganate is a strong oxidizing agent.
It oxidizes oxalate ions and in turn permanganate is itself reduced.
Hence, it is decolourized.
If Fe(II) ions are present in the solution, then they will also be oxidized. They will form Fe(III) ions and in turn will reduce permanganate. Hence, permanganate will be decolurized.

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