| 1 |
During the process of crystallization, the hot saturated solution. |
- A. Is cooled very slowly to get large sized crystals.
- B. Is cooled at a moderate rate to get medium sized crystals
- C. Is evaporated to get the crystals of the product.
- D. Is mixed with an immiscible liquid to get the pure crystals of the product.
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| 2 |
Which one of the following substances is not sublime material. |
- A. Iodine
- B. Benzoic acid
- C. Ammonium chloride
- D. Potash alum
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| 3 |
Solvent extraction method is particularly useful technique for separation when the product to be separated is |
- A. Non-volatile or thermally unstable
- B. Volatile or thermally unstable
- C. Non-volatile or thermally stable
- D. Volatile or unstable
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| 4 |
In chromatographic technique. Rf has unit. |
- A. Mol dm-3
- B. Cm
- C. m3
- D. No units
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| 5 |
Several types of filter media are used for filtration depending on |
- A. Natural of reactants
- B. Nature of reaction
- C. Size of precipitate
- D. Nature of filter paper
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| 6 |
Drying agent used in crystallization is. |
- A. P2O3
- B. Animal charcoal
- C. KMnO4
- D. Water
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| 7 |
During the process of crystallization, the hot saturated solution; |
- A. Is cooled very slowly to get large-sized crystals
- B. Is cooled at a moderated rate to get medium-sized crystals
- C. Is evaporated to get the crystals of the product
- D. Is mixed with an immiscible liquid to get the pure crystals of the produce
|
| 8 |
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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| 9 |
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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| 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
|