HPLC
In reversed phase HPLC, there is a

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

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