HPLC
In reversed phase HPLC, there is a

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

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HPLC
An eluotropic series

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

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