HPLC
The eluent strength is a measure of

solvent diffusivity
solvent adsorption energy
solvent absorption energy
solvent mixing index

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HPLC
Void volume refers to the

the time required for the gradient to reach the column
the volume of the column between the point at which solvents are mixed and the beginning of 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

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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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