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During estima...

Question

During estimation of oxalic acid Vs $K M n O_{4}$ , self indicator is.

K M n O_{4}

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Oxalic acid

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K_{2} S O_{4}

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M n S O_{4}

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Solution

The correct option is A $K M n O_{4}$
OXalic-acid vs $K M n O_{4}$
Oxalic Acid - $K M n O_{4}$ Titrations
Reaction: Potassium permanganate is a strong oxidant in presence of sulphuric acid so it can be used for the estimation of oxalic acid (oxalates). Oxalic acid reacts with the acidic $K M n O_{4}$

$2 K M n O_{4} + 3 H_{2} S O_{4} \to K_{2} S O_{4} + 2 M n S O_{4} + 3 H_{2} O + 5 [O]$
$5 (C O O H)_{2} + 5 [O] \to 5 H_{2} O + 10 C O_{2} ↑$
Indicator Last drop of $K M n O_{4}$ itself acts as an indicator.
End point Appearance of light pink colour.

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