HPLC
In normal phase HPLC, there is a

polar solvent/non-polar column
non polar solvent/polar column
non polar solvent/non-polar column
any of the above

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

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
inversely related to the cube root of the peak width

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