HPLC
For a typical adsorbent such as silica gel, the most popular pore diameters are

10 and 50 A°
60 and 100 A°
100 and 150 A°
150 and 200 A°

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HPLC
Column efficiency is measured in terms of number of plates which is

inversely related to the square of the peak width
inversely related to the cube root of the peak width
directly related to the square of the peak width
directly related to the square of the peak width

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HPLC
Dwell volume is defined as

the volume of the column between the point at which solvents are mixed and the beginning of the column
none of these
the volume of solvent contained in a liquid chromatographic column
the time required for the gradient to reach the column

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