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What is the use of KMnO4 in the manufacture of methanol?

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What is the use of KMnO4 in the manufacture of methanol?

(a) To increase pH

(b) To decrease pH

(c) To remove impurities

(d) To increase turbidity

I got this question in examination.

Enquiry is from Synthetic Organic Chemical Industries topic in section Synthetic Organic Chemical Industries of Chemical Technology

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The correct choice is (c) To remove impurities

Easiest explanation: KMnO4 is added to remove trace of impurities such as ketones and aldehydes. Presence of impurities decreases the purity of methanol.

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