HPLC
Dwell volume is defined as

the time required for the gradient to reach the column
none of these
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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HPLC
An eluotropic series

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

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