HPLC
HPLC methods include

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

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

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

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HPLC
Dwell volume is defined as

none of these
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
the volume of solvent contained in a liquid chromatographic column

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HPLC
Void volume refers to the

the time required for the gradient to reach the column
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
total volume of eluent in the column the remainder being taken up by the packing material

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