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Which of the following is the commonly used support material for the packed column in gas chromatography?

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Which of the following is the commonly used support material for the packed column in gas chromatography?

(a) Glass

(b) Metal

(c) Diatomaceous earth

(d) Stainless steel

I have been asked this question by my college director while I was bunking the class.

I'm obligated to ask this question of Gas Chromatography topic in division Chromatography of Analytical Instrumentation

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The correct answer is (c) Diatomaceous earth

For explanation I would say: Diatomaceous earth is the commonly used support material for the packed column in gas chromatography. The columns could be made of glass or metal.

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