Discussion
In gas chromatography, the basis of separation of the components is the difference in :
Answer: D
Separation in gas chromatography rests on differences in partition coefficient.
The sample is carried through the column by an inert gas (the mobile phase), and each component distributes itself between the gas and the stationary liquid or solid phase. The partition (distribution) coefficient K = Cstationary/Cmobile decides how long a component is held back: a component with a larger K spends more time in the stationary phase and elutes later, so components with different K values leave the column at different retention times.
Molecular weight influences volatility and hence K, but it is not itself the basis; two compounds of equal mass can still separate. Conductivity and molarity play no part in the separation (a thermal conductivity detector only detects what has already separated).
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