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

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

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HPLC
Column efficiency is measured in terms of number of plates which is

directly related to the square of the peak width
inversely related to the square of the peak width
inversely related to the cube root of the peak width
directly related to the square of the peak width

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HPLC
HPLC methods include

ion exchange and size exclusion chromatography
liquid/solid (adsorption) chromatography
All of these
liquid/liquid (partition) chromatography

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HPLC
An eluotropic series

is a measure of the solvent adsorption energy
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
None of these

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