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If the mobile phase is gas, movement of solute is determined by its ____________

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If the mobile phase is gas, movement of solute is determined by its ____________

(a) Boiling point

(b) Melting point

(c) Solubility

(d) Volatility

I got this question during an interview for a job.

This interesting question is from Chromatography topic in division Methods of Purification of Engineering Chemistry I

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Correct answer is (d) Volatility

The best I can explain: If the mobile phase is gas, movement of solute is determined by its volatility because gas is always measured as volatility not as solubility or melting point or boiling point.

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