| 1 |
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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| 2 |
Solvent extraction is an equilibrium process and is controlled by. |
- A. Law of mass action
- B. The mount of solvent used
- C. The amount of solute
- D. Distribution law
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| 3 |
Solvent extraction method is particularly useful technique for separation when the product to be speared is. |
- A. Non volatile or thermally unstable
- B. Volatile or thermally stable
- C. Non volatile or thermally stable
- D. Volatile or thermally unstable
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| 4 |
Which one of the following methods will be used to separate the mixture of NaCl and sand. |
- A. Chromatography
- B. Solvent extraction
- C. Sublimation
- D. Filtration
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| 5 |
Solvent extraction is an equilibrium process and it is controlled by |
- A. Law of mass action
- B. The amount of solvent used
- C. Distribution law
- D. The amount of solute
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| 6 |
When i<sub>2</sub>present in the aquous layer in the form of I<sup>-1</sup><sub>3</sub>foes to CCI<sub>4</sub>layer, then the change in colour is from |
- A. Purple to brown
- B. Purple to green
- C. Green to brown
- D. Brown to purple
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| 7 |
In chromatographic technique. Rf has unit. |
- A. Mol dm-3
- B. Cm
- C. m3
- D. No units
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| 8 |
Chromatographic technique is very useful for |
- A. Isolation
- B. Purification
- C. separation
- D. All of them
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| 9 |
Which is not used as drying agent in a desiccator. |
- A. Cacl2
- B. NaCl
- C. P2O5
- D. Salica Gel
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| 10 |
In order to have good crystals of a substance the temperature of the system at the time of preparation of solution should be |
- A. Around 0°C
- B. Around room temperature
- C. Sufficiently more than room temperature
- D. Just above the room temperature
|