HPLC
HPLC stands for

both (a) and (b)
High Performance Liquid Chromatography
High Pressure Liquid Chromatography
Highly Placed Liquid Chromatography

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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
total volume of eluent in the column the remainder being taken up by the packing material
the volume of the column between the point at which solvents are mixed and the beginning of the column

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

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