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Which of the following cannot be used as an adsorbent in Column adsorption chromatography?

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Which of the following cannot be used as an adsorbent in Column adsorption chromatography?

(a) Magnesium oxide

(b) Silica gel

(c) Activated alumina

(d) Potassium permanganate

I have been asked this question in a national level competition.

My question comes from Introduction to Chromatography in portion Chromatography of Analytical Instrumentation

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Correct answer is (d) Potassium permanganate

Explanation: The given options are all examples of adsorbents in Column adsorption except potassium permanganate. Some other adsorbents are starch and chromatographic purified siliceous earth.

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