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MCQ on principles of chromatography: Page-5

30% of methanol and 70% of acetone are used as mobile phase in the entire elution of the analyte through the column. The type of elution is
Isocratic

(A) P

(B) Q

(C) R

(D) S

Which of the following type of materials are used for size exclusion column packings

(A) Stryene-polyvinyl benzene polymers

(B) 2-Hydroxyethyl methacrylate polymers

(C) Porous glasses

(D) All of the above

The height equivalent to theoretical plate (HETP) is expressed by

(A) S

(B) R

(C) Q

(D) P

The ratio of adjusted retention time for analyte to the retention time of mobile phase is

(A) Retention factor

(B) Selectivity factor

(C) Retardation factor

(D) Capacity factor

The efficiency of separation decreases due to all of the following except

(A) Eddy depression

(B) Very high flow rates

(C) Very low flow rates

(D) Increase in number of theoretical plates