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The gas-solid chromatography is ______________ chromatography as per basic principle involved.

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The gas-solid  chromatography is ______________  chromatography as per basic principle involved.

(a) Exclusion

(b) Ion-exchange

(c) Adsorption

(d) Absorption

This question was addressed to me in an international level competition.

My enquiry is from Chromatography in chapter Methods of Purification of Engineering Chemistry I

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The correct option is (c) Adsorption

Easiest explanation: The gas-solid chromatography is adsorption chromatography as per basic principle involved as the gas molecules are adsorbed on the solid surface.

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