HPLC
Which of the following(s) is/are the advantage of HPLC over traditional LPLC (low-pressure liquid chromatography)?

Ideal for ionic species and large molecules
Greater sensitivity and reusable columns
Sample recovery
All of these

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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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