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Which acid can decolourise
purple coloured Potassium Permanganate solution?
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Citric acid turns potassium permanganate from purple to colourless because it is a reducing agent. KMnO4 will oxidize citric acid to CO2 and H2O and itself will turn into almost colourless Mn (2+) (in acidic environment), or, into brown MnO2 precipitate.