HPLC
Dwell volume is defined as

the time required for the gradient to reach the column
none of these
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

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HPLC
Void volume refers to the

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
the volume of solvent contained in a liquid chromatographic column
the time required for the gradient to reach the column

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