1. A complete quantitative determination of a compound generally consists of major steps.

a)1 b)2

c)3 d)4

There are four steps involved in quantitative analysis:

2. Which of the following is the best method for drying of crystals?

a) Vacuum desiccator

b) Drying in oven

c) Evaporation of solution

d) Pressing between several folds of filter paper

3. To prevent premature crystallization during filtration:

a) Hot saturated solution must be filtered

b) Hot water funnel must be used

c) Hot saturated solution should be cooled at slow rate

d) Both Aand B

4. Water bath is used if the solvent is:

a) Volatile b) Inflammable

c) Explosive d) All of these

5. Which purification technique is based on distribution law?

a) Crystallization b) Solvent extraction

Cc) Sublimation d) Filtration

6. I= is present in aqueous layer as 13 lion when it goes to CCls layer, then colour changes from:

a) Purple to brown b) Purple to green

c) Green to brown d) Brown to purple

7. To locate the position of lead ions on a chromatogram which locating agent is used:

A. H2S B. Pb(NO:3)2 C. HCI D. HNO:3

8. A mixture of 16 amino acids was obtained by hydrolysis of protein, how can these amino acids separated and identified by:

a) Precipitation b) Solvent extraction

c) Sublimation d) Chromatography

9. Chromatography is a technique.

a) Purification b) Identification

c) Isolation d) All of these

10. Most common solvent extraction for organic compounds is:

a) lodine extraction b) Ether extraction

c) Benzoic acid extraction d) Both A and B

11. Which statement is not true about Gooch

crucible?

a) It is made up of porcelain material

b) It can be used with suction filtering apparatus

c) It is used for ignitable precipitates

d) It needs no preparation before use

12. Which one of the following is the most safe and reliable method for drying of crystals in crystallization process?

a) Air b) Vacuum desiccator

c) Oven d) Filter paper

13. Which is used for removal of false colour from crystals in crystallization?

a) Calcium chloride b) Phosphorus pentaoxide

c¢) Animal charcoal d) Hydrogen sulphide

14. The disadvantage associated with formation of larger crystals is that:

a) They contain impurities

b) They contain larger amount of solvent

c) They create complexity in drying

d) All of these

15. Which one is not the property of an ideal solvent for crystallization?

a) Chemically inert for solute

b) Inexpensive

c) Safe to use

d) Hard to remove

16. Which one is not the type of paper chromatography?

a) Ascending b) Descending

c) Column d) Radial

17. A filtering operation could be very time consuming if it was not aided by gentle suction which is developed:

a) If the paper covers the funnel upto its

circumference

b) If the paper fits tightly

c) If the paper has got small sized pores in it

d) If the stem of the funnel is large so that it dips info the filtrate

18. Which of the following locating agents is/are correctly matched?

a) Ninhydrin — amino acids

b) Hydrogen sulphide —Cd*?and Pb*?

c) Rubeanic acid — Cut*?, Mn*?, Co™?

d) All of these

19. The method of solvent extraction is used when the product to be separated is:

a) Volatile and thermally stable

b) Non-volatile and thermally unstable

c) Non-volatile and thermally stable

d) Volatile and thermally unstable

20. Which one of the following is not a sublimed

solid?

a) Sodium chloride b) Naphthalene

c) lodine d) Ammonium chloride

21. All are locating agents EXCEPT:

ad) Rubeanic acid ) Ninhydrin

c) Carbon disulphide d) Hydrogen sulphide

22. Which of the following is the most convenient and

perfect way of filtration?

a) By fluted filter paper

b) Sintered glass crucible

c) Gooch crucible

d) Ordinary filter paper

23. Which method is used to remove insoluble solids from muddy water?

a) Filtration b) Evaporation

c) Distillation d) Chlorination

24. The solvent is chosen on basis for the process of crystallization:

a) On polar nature b) Hit and trial

c) Non-polar nature d) Chemical reactivity

25. Which statement is incorrect about chromatography?

a) Mobile phase may be gas or liquid

b) Stationary phase may be liquid or solid

c) In paper chromatography, the stationary and

mobile phases are liquids

d) Ri: value has always certain unit