| 1 |
Chromatographic technique is very useful for |
- A. Isolation
- B. Purification
- C. separation
- D. All of them
|
| 2 |
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
|
| 3 |
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
|
| 4 |
The paper at which separation of solute have been taken place is called. |
- A. Retardation factor
- B. Chromatogram
- C. Base line
- D. Solvent front
|
| 5 |
Which statement about Gooch crucible is incorrect. |
- A. It is made up of porcelain
- B. Quick filtration occur by using suction filtering apparatus
- C. All the chemicals which reacts with paper can be filtered.
- D. Filter medium used in this crucible consists many folds of filter paper only.
|
| 6 |
The drying agent used in a desiccator. |
- A. Agcl
- B. NH4Cl
- C. P2O5
- D. AlCl3
|
| 7 |
"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
|
| 8 |
In chromatographic technique. Rf has unit. |
- A. Mol dm-3
- B. Cm
- C. m3
- D. No units
|
| 9 |
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
|
| 10 |
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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