| 1 |
Which is not used as drying agent in a desiccator. |
- A. Cacl2
- B. NaCl
- C. P2O5
- D. Salica Gel
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| 2 |
One of the following substances does not undergo sublimation |
- A. KMnO<sub>4</sub>
- B. Naphthalene
- C. NH<sub>4</sub>CI
- D. Iodine
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| 3 |
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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| 4 |
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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| 5 |
The drying agent used in a desiccator. |
- A. Agcl
- B. NH4Cl
- C. P2O5
- D. AlCl3
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| 6 |
Which of the following precautions in necessary for smooth filtration |
- A. The filter paper should be of big size
- B. The tip of funnel should not touch the side of the beaker
- C. The stem of the funnel should be very small
- D. The stem of he funnel should remain continuously full of liquid
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| 7 |
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
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| 8 |
In chromatographic technique. Rf has unit. |
- A. Mol dm-3
- B. Cm
- C. m3
- D. No units
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| 9 |
If fluted fitter paper, rate of filtration increases as compared tot he cone shaped filter paper because. |
- A. It has greater number of holes in it.
- B. It has greater surface are of filtration
- C. Fluted filter paper has greater pore sizes than cone shaped filter paper.
- D. Thickness of paper is more than cone shaped filter paper
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| 10 |
Which of the following substances is used as decolorizing agent. |
- A. Silica gel
- B. Animal charcoal
- C. conc. H2SO4
- D. Asbestos
|