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

is changed continuously or in a series of steps
None of these
both (a) and (b)
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 cube root of the peak width
directly related to the square of the peak width
inversely related to the square of the peak width

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