| 1 |
In solvent extraction, solute can be separated from solution, by shaking the solution with solvent in which the solute is. |
- A. More soluble
- B. Partially soluble
- C. Insoluble
- D. soluble at high temp
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| 2 |
When hot saturated solution is cooled very rapidly, we get |
- A. Medium sized crystals
- B. large sized crystals
- C. Premature crystallization of the substance
- D. Old crops of crystals
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| 3 |
Large value of distribution coefficient K means. |
- A. Component of solute dissolved large in mobile phase
- B. Components of solute do not dissolve in mobile phase
- C. Components of solute remains at original spot
- D. All statements are correct
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| 4 |
The iodine present in water can be separated by which one of the following techniques |
- A. Sublimation
- B. Chromatography
- C. Filtration
- D. Solvent extraction
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| 5 |
Which one of the following substances is used as decolouring agent |
- A. Animal charcol
- B. Concentrated H<sub>2</sub>SO<sub>4</sub>
- C. CaCI<sub>2</sub>
- D. Silica gel
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| 6 |
Safe and reliable method of drying crystals is through. |
- A. Pressing it between folds of filter paper
- B. Drying it in oven
- C. Evaporation of solution
- D. Vacuum desiccator
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| 7 |
Chromatography in which the stationary phase is a solid is classified as. |
- A. Partition chromatography
- B. Gas chromatography
- C. Adsorption Chromatography
- D. Thin layer chromatography
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| 8 |
The comparative rates at which the solutes move in paper chromatography depend on. |
- A. The size of paper used
- B. Rf values of solutes
- C. Temperature of the experiment
- D. Size of the chromatographic tank used
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| 9 |
The crystallization of a solid substance is done from a hot saturated solution. The solution is |
- A. Evaporated rapidly
- B. Cooled very slowly to get good crystals
- C. Cooled rapidly to get excellent crystals
- D. Mixed with another miscible solvent
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| 10 |
The comparative rates at which the solutes move in paper chromatography depends on. |
- A. The size of paper used
- B. Their Rt values solutes
- C. Temp of the experiment
- D. Size the chromate grapic tank
|