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Why is potassium permangante used for cl...

Why is potassium permangante used for cleaning of water tanks ?

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(i) Potassium permanganate oxidises dissolved iron, manganese and hydrogen sulphide into solid particles.
(ii) `KMnO_(4)` is used to remove organic matter from the water tank by oxidation which also removes unwanted taste and odour.
(iii) It also kills harmful bacteria and fungi.
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