HPLC
HPLC methods include

liquid/liquid (partition) chromatography
All of these
ion exchange and size exclusion chromatography
liquid/solid (adsorption) chromatography

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

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

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HPLC
An eluotropic series

None of these
ranks solvents by their relative abilities to displace solutes from a given absorbent
ranks column packing material by their relative abilities to retain solutes on the column
is a measure of the solvent adsorption energy

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HPLC
Void volume refers to the

the time required for the gradient to reach the column
total volume of eluent in the column the remainder being taken up by the packing material
the volume of solvent contained in a liquid chromatographic column
the volume of the column between the point at which solvents are mixed and the beginning of the column

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