HPLC
A gradient elution in HPLC is one in which the composition of the solvent

None of these
both (a) and (b)
remains constant
is changed continuously or in a series of steps

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HPLC
Dwell volume is defined as

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
none of these

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HPLC
HPLC stands for

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

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