| 1 |
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
|
| 2 |
During paper chromatography, the stationary phase is. |
- A. Solid
- B. Liquid
- C. Gas
- D. Plasma
|
| 3 |
The substance used for decolorization of crystalline substance is |
- A. G2O5
- B. Chloroform
- C. Animal charcoal
- D. Soda ash
|
| 4 |
The comparative rates at which the solutes move in paper chromatography, depends on |
- A. The size of paper used
- B. Their R<sub>f </sub>values
- C. Their partition coefficients
- D. The polarity of solvent used
|
| 5 |
During chromatography strip should be dipped into solvent mixture to a depth of. |
- A. 3-4 mm
- B. 4-5 mm
- C. 5-6 mm
- D. 6-7 mm
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| 6 |
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
|
| 7 |
Which one of the following is not property of a good solvent. |
- A. It should be inexpensive
- B. It should dissolve impurities easily
- C. It should dissolve large amount of solute at boiling point and less amount of solute at low temperature.
- D. It should not react chemically with solute
|
| 8 |
Which is not used as drying agent in a desiccator. |
- A. Cacl2
- B. NaCl
- C. P2O5
- D. Salica Gel
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| 9 |
"The components of which mixture can be separated by filtration". |
- A. NaCl and CaCl2
- B. Calcium carbonate and NaCl
- C. Blue and green inks
- D. Sand and naphthalene
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| 10 |
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
|