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- Question
An isocratic elution in HPLC is one in which the composition of the solvent
Options- A. remains constant
- B. changes continuously
- C. changes in a series of steps
- D. none of these
- Correct Answer
- remains constant
- 1. Column efficiency is measured in terms of number of plates which is
Options- A. inversely related to the square of the peak width
- B. directly related to the square of the peak width
- C. inversely related to the cube root of the peak width
- D. directly related to the square of the peak width Discuss
- 2. Which of the following(s) is/are the advantage of HPLC over traditional LPLC (low-pressure liquid chromatography)?
Options- A. Greater sensitivity and reusable columns
- B. Ideal for ionic species and large molecules
- C. Sample recovery
- D. All of the above Discuss
- 3. Dwell volume is defined as
Options- A. the volume of solvent contained in a liquid chromatographic column
- B. the time required for the gradient to reach the column
- C. the volume of the column between the point at which solvents are mixed and the beginning of the column
- D. none of these Discuss
- 4. The eluent strength is a measure of
Options- A. solvent adsorption energy
- B. solvent absorption energy
- C. solvent diffusivity
- D. solvent mixing index Discuss
- 5. A gradient elution in HPLC is one in which the composition of the solvent
Options- A. remains constant
- B. is changed continuously or in a series of steps
- C. both (a) and (b)
- D. none of the above Discuss
- 6. In normal phase HPLC, there is a
Options- A. non polar solvent/polar column
- B. polar solvent/non-polar column
- C. non polar solvent/non-polar column
- D. any of the above Discuss
- 7. For a typical adsorbent such as silica gel, the most popular pore diameters are
Options- A. 10 and 50 A°
- B. 60 and 100 A°
- C. 100 and 150 A°
- D. 150 and 200 A° Discuss
- 8. The highly folded membranes found in such eukaryotic organelles as mitochondria and chloroplasts
Options- A. increase the surface area where key chemical processes can occur
- B. help the cell against physical damage
- C. make it possible to package large amounts of DNA within the cell
- D. assist with cell movement Discuss
- 9. Lysosomes are specialized vesicles in __________ that contain digestive enzymes for the breakdown of food. A related organalle known as a vacuole, which is found in __________ , also contains enzymes but in addition may act as a storage organelle for nutrients or water.
Options- A. animals; plants and fungi
- B. plants; animals and fungi
- C. plants and fungi; animals
- D. animals and plants; fungi Discuss
- 10. Which of the following is present in both prokaryotes and eukaryotes?
Options- A. Lysosome
- B. Chloroplast
- C. Plasma membrane
- D. Vacuole Discuss
HPLC problems
Search Results
Correct Answer: inversely related to the square of the peak width
Correct Answer: All of the above
Correct Answer: the volume of the column between the point at which solvents are mixed and the beginning of the column
Correct Answer: solvent adsorption energy
Correct Answer: is changed continuously or in a series of steps
Correct Answer: non polar solvent/polar column
Correct Answer: 60 and 100 A°
Correct Answer: increase the surface area where key chemical processes can occur
Correct Answer: animals; plants and fungi
Correct Answer: Plasma membrane
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