HPLC
In reversed phase HPLC, there is a

polar solvent/non-polar column
non polar solvent/polar column
any of the above
non polar solvent/non-polar column

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HPLC
An eluotropic series

is a measure of the solvent adsorption energy
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

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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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