HPLC
A gradient elution in HPLC is one in which the composition of the solvent

both (a) and (b)
remains constant
is changed continuously or in a series of steps
None of these

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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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HPLC
Dwell volume is defined as

the time required for the gradient to reach the column
the volume of solvent contained in a liquid chromatographic column
none of these
the volume of the column between the point at which solvents are mixed and the beginning of the column

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HPLC
Void volume refers to the

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
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

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