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Mobile phase can be ___________

(a) Only solid

(b) Only gas

(c) Solid or liquid

(d) Liquid or gas

This question was posed to me in an online interview.

The doubt is from Working with Proteins in section Amino Acids, Peptides and Proteins of Biochemistry

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Correct answer is (d) Liquid or gas

To explain I would say: Only liquids and gases can flow through to act as a mobile phase.

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