11th class (FSc) chemistry Unit 2 MCQs
18. Solvent extraction is an equilibrium process and it is controlled by:
a. Distribution law
b. Law of mass action
c. The amount of solute
d. The amount of solvent used
19. Repeated extractions using small portions of solvent are more:
a. Slow
b. Accurate
c. Rapid
d. Efficient
20. Iodine dissolves in water in the presence of Kl due to formation of which one of the following species?
a. l3-1
b. l2
c. l4-1
d. l-1
21. In solvent extraction, the law applied:
a. Coulomb’s law
b. Law of mass action
c. Boyle’s law
d. Distribution law
22. In …… technique a solute distribute between two immiscible liquids:
a. Filtration
b. Crystallization
c. Distillation
d. Solvent extraction
23. The chromatography in which stationary phase is liquid is called:
a. Bolumn chromatography
b. Partition chromatography
c. Adsorption chromatography
d. All of these
24. In chromatography, the stationary phase:
a. Is a liquid
b. Is a solid
c. May be solid or liquid
d. May be liquid or gas
25. In paper chromatography, the to which the solvent rises to maximumextent is called:
a. Solvent front
b. Eluent
c. Base line
d. Chromatography
26. A component having small value of K( distribution co-efficient) mostlyremains is:
a. Mobile phase
b. Stationary phase
c. None of these
d. Chromatographic tank
27. In paper chromatography, the mobile phase is usually:
a. Organic liquid
b. Liquid ammonia
c. Water
d. None of these
28. The comparative rate at which the solutes move in paper chromatography depends on:
a. Rf value of solute
b. The size of paper
c. Size of the chromatographic ta used
d. Temperature of the experiment
29. Chromatography in which the stationary phase is a solid classfied as:
a. Gas chromatography
b. Partition chromatography
c. Thinlayer chromatography
d. Adsorption chromatography
30. A filtration process could be very time consuming if it were not aided by a gentle suction which is developed:
a. If the stem of funnel is large so that it dips into filtrate
b. If the paper covers the funnel up to its circumference
c. If the paper fit tightly
d. If the paper has got small sized pores in it
31. During the crystallization, the hot saturated solution:
a. Is evaporated to get the crystals of product
b. is cooled very slowly to get large size crystals
c. Is mixed with an immiscible liquid to get the pure crystals of product
d. Is cooled at moderate rate to get medium size crystals
32. Solvent extraction is a equilibrium an it is controlled by:
a. Distribution law
b. Law of mass action
c. The amount of solute
d. Amount of solvent
33. Solvent extraction technique is particularly useful technique for the separation when the prodeuct to be separated is:
a. Non-volatile or thermally stable
b. Non-volatile or thermally unstable
c. Volatile or thermally unstable
d. Volatile or thermally stable
34. The comparative rate at which solute moves in paper chromatography depends upon:
a. Temperature of experiment
b. The size of paper
c. Size of chromatography tank used
d. Rf value of solute
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