||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
||During paper chromatography, the stationary phase is.
- A. Solid
- B. Liquid
- C. Gas
- D. Plasma
||The substance used for decolorization of crystalline substance is
- A. G2O5
- B. Chloroform
- C. Animal charcoal
- D. Soda ash
||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
||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
||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
||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
||Which is not used as drying agent in a desiccator.
- A. Cacl2
- B. NaCl
- C. P2O5
- D. Salica Gel
||"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
||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