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Which of the following is the ratio of the interstitial volume of packing to the volume of its total mass?

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Which of the following is the ratio of the interstitial volume of packing to the volume of its total mass?

(a) Distribution constant

(b) Volumetric phase ratio

(c) Retention factor

(d) Total porosity

I had been asked this question during an interview.

Query is from Chromatographic Behaviour of Solutes in section Chromatography of Analytical Instrumentation

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Correct choice is (d) Total porosity

For explanation: Total porosity is the ratio of the interstitial volume of packing to the volume of its total mass. In a capillary column, total porosity is 1.

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