Classical separation techniques: column, thin layer and paper chromatography - One Line Questions

1. In column chromatography, the process of passing the mobile phase through the packed stationary phase to separate components is called: — Elution
2. What is the term for the process where components are separated based on their differential partitioning between two immiscible liquid phases, one of which is immobilized on a solid support? — Partition Chromatography
3. Which type of chromatography is characterized by a stationary phase coated on a flat glass or plastic plate and a mobile phase that moves up the plate by capillary action? — Thin-Layer Chromatography (TLC)
4. Which classical separation technique is most suitable for qualitative analysis of small amounts of samples, such as identifying components in a plant extract? — Thin-Layer Chromatography (TLC)
5. In column chromatography, what is the effect of increasing the polarity of the mobile phase when using a normal-phase stationary phase (like silica gel)? — Components will elute faster
6. In column chromatography, what is the effect of using a finer particle size for the stationary phase material? — Increased surface area and improved separation efficiency
7. What is the fundamental principle behind all chromatographic separation techniques? — Differential partitioning of components between a stationary phase and a mobile phase
8. What is the primary basis for separation in partition chromatography? — Differences in solubility between two immiscible liquid phases
9. What is the phenomenon where components of a mixture travel at different rates through the stationary phase due to varying affinities? — Differential migration
10. In column chromatography, a longer column generally leads to: — Better separation
11. In paper chromatography, the mobile phase moves through the stationary phase primarily due to: — Capillary action
12. Which of the following is a common method to visualize separated spots in TLC or paper chromatography when the compounds are colorless? — Using a UV lamp or chemical staining reagents
13. When performing reverse-phase chromatography, which type of mobile phase is typically used for optimal separation? — A mixture of polar and nonpolar solvents
14. What is the stationary phase in classical paper chromatography primarily composed of? — Bound water molecules within the cellulose matrix
15. Which statement is TRUE regarding the relationship between Rf value and solvent polarity in normal-phase TLC? — Increasing solvent polarity increases Rf values
16. When using a polar stationary phase (like silica) and a polar mobile phase in column chromatography, compounds that are less polar will tend to: — Interact less strongly with the stationary phase and elute earlier
17. In paper chromatography, if a compound has a very low Rf value, it implies that the compound: — Is weakly soluble in the mobile phase and strongly adsorbed to the stationary phase
18. Which of the following is a limitation of paper chromatography? — The stationary phase (water held by cellulose) can be difficult to control
19. What is the primary advantage of using silica gel as a stationary phase in TLC compared to paper? — It provides more reproducible separations and higher resolution
20. What is the main advantage of Thin-Layer Chromatography (TLC) over Paper Chromatography for many applications? — It typically provides faster separations and sharper spots
21. In column chromatography, what is the advantage of using a gradient elution compared to an isocratic elution? — It can provide better separation for complex mixtures with a wide range of component polarities
22. What is the role of the solvent front in paper and thin-layer chromatography? — It marks the furthest point reached by the mobile phase
23. Which of these is NOT a typical application of Thin-Layer Chromatography (TLC)? — Separating complex mixtures for large-scale purification
24. What is the primary characteristic of the stationary phase in 'normal-phase' chromatography? — Polar
25. What is the primary characteristic of the stationary phase in 'reverse-phase' chromatography? — Nonpolar
26. Which chromatographic technique is most suitable for separating a mixture of very similar, non-volatile organic compounds? — Thin-Layer Chromatography (TLC)
27. Thin-Layer Chromatography (TLC) is often used as a preliminary technique to optimize conditions for which other chromatographic method? — Column Chromatography
28. What is the term for the process of separating components based on their differential distribution between a liquid stationary phase and a gas mobile phase? — Gas Chromatography
29. Which of the following is a disadvantage of using paper chromatography for quantitative analysis? — It is difficult to obtain precise quantitative results due to paper variability and charring
30. In paper chromatography, if the mobile phase is too polar, what is the likely outcome for a separation involving polar and nonpolar compounds? — All compounds will likely have very high Rf values and poor separation
31. In column chromatography, what is the term for the component that moves fastest through the column? — Early eluting component
32. Paper chromatography can be used for quantitative analysis if the separated spots are visualized and then: — Eluted and their concentration measured spectrophotometrically
33. Paper chromatography utilizes a stationary phase composed of which material? — Cellulose (paper)
34. What does the 'T' in TLC stand for? — Thin
35. Which factor is LEAST likely to affect the Rf value of a compound in paper chromatography? — The concentration of the sample applied
36. In column chromatography, 'channeling' refers to: — The formation of pathways in the stationary phase, leading to poor separation
37. What is the 'spotting line' in TLC and paper chromatography? — The line where the sample is initially applied to the stationary phase
38. In column chromatography, what serves as the stationary phase? — A solid adsorbent packed into a vertical column
39. Which statement best describes the 'stationary phase' in a chromatographic system? — The phase that remains fixed and interacts with the sample components
40. What is the 'Rf value' in chromatography? — The ratio of the distance traveled by the solute to the distance traveled by the solvent front
41. Which of the following factors can influence the Rf value of a compound in TLC? — The choice of stationary phase and mobile phase
42. Which type of chromatography is best suited for separating large quantities of material for preparative purposes? — Column Chromatography
43. What is the primary role of the mobile phase in Thin-Layer Chromatography (TLC)? — To carry the sample components up the plate via capillary action
44. What is the primary function of the mobile phase in column chromatography? — To carry the separated components out of the column
45. What is the primary purpose of developing a chromatogram in TLC or paper chromatography? — To allow the mobile phase to move up the plate/paper and separate the components
46. What is the purpose of the 'developing chamber' in TLC and paper chromatography? — To hold the solvent and allow it to saturate the atmosphere
47. A compound that is more strongly adsorbed to the stationary phase (or more soluble in the stationary phase) will generally: — Travel slower and elute later
48. What is 'overloading' in column chromatography? — Applying too much sample, leading to poor separation
49. In Thin-Layer Chromatography (TLC), what is typically used as the stationary phase? — Silica gel or alumina
50. In adsorption chromatography, the separation is based on the differences in the degree of adsorption of components onto the surface of the stationary phase. Which of the following is a common stationary phase for adsorption chromatography? — Silica gel
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