Chemistry Experimental Techniques Online Mcqs Test

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Question 1

1. The process involves converting a solid directly into vapors and these vapors are the condensed to form solid again is called

Answer

Crystallization

Answer

Sublimation

Answer

Evaporation

Answer

Decomposition

Question 2

2. Which one is not the drying agent

Answer

Phosphorus penta-oxide

Answer

Silica gel

Question 3

3. The comparative rates at which the solutes move in paper chromatography depend on

Answer

The size of paper used

Answer

Rf values of solutes

Answer

Temperature of the experiment

Answer

Size of the chromatographic tank used

Question 4

4. During the process of crystallization the hot saturated solution

Answer

Cooled at a moderate rate to get medium sized crystals

Answer

Evaporated to get the crystals of the product

Answer

Cooled very slowly to get large sized crystals

Answer

Mixed with an miscible liquid to get the pure crystals of the product

Question 5

5. Solvent extraction method is particularly useful technique for separation when the product to be separated is

Answer

Volatile or thermally stable

Answer

Non – volatile or thermally unstable

Answer

Volatile or thermally unstable

Answer

Non – volatile or thermally stable

Question 6

6. Several types of filter media are used for filtration depending on

Answer

Nature of filter paper

Answer

Nature of precipitate

Answer

Nature of reactants

Answer

Nature of reaction

Question 7

7. Which of the following is not a separation technique?

Answer

Sublimation

Answer

Filtration

Answer

Solvent extraction

Question 8

8. The most common example of solvent extraction is

Answer

Naphthalene

Answer

Chloroform

Question 9

9. Solvent extraction is an equilibrium process and it is controlled by

Answer

Amount of solute

Answer

Law of mass action

Answer

Amount of solute used

Answer

Distribution law

Question 10

10. For smooth filtration one of the following precautions should be observed

Answer

The stem of the funnel should be small

Answer

The filter paper should be small

Answer

The stem of the funnel should remain continuously full of liquids

Answer

The tip of funnel should not touch the beaker

Question 11

11. In crystallization, if the solvent is inflammable then direct heating is

Answer

Depends on temperature

Answer

Crystallization does not involve heating

Question 12

12. The process of filtration is used to

Answer

Separate insoluble particles from liquids

Answer

Separate the two immiscible liquids

Answer

Separate solute from solution

Answer

Separate the two miscible liquids

Question 13

13. I₂ present in water can be extracted by using which of the following solvent

Answer

Acetic acid

Answer

Carbon tetrachloride

Answer

Chloroform

Question 14

14. During the folding of filter paper the apex form angle of about

Question 15

15. In paper chromatography the rate at which solutes move depends on

Answer

Distribution law

Answer

Law of partial pressure

Answer

Law of specific proportion

Answer

Distribution coefficients

Question 16

16. Sintered glass crucible is used for

Answer

Convenient filtration than that by Gooch crucible

Answer

Purification of slid

Answer

To avoid premature crystallization of solute

Answer

Separation of two miscible liquids

Question 17

17. Which pairs of the following components can be separated by sublimation?

Answer

Sand and Nacl

Answer

Sand and naphthalene

Answer

Nacl and Kcl

Answer

Sand and broken pieces of glass

Question 18

18. Which one is the property of an ideal solvent?

Answer

Should be expensive

Answer

It should react chemically with the solute

Answer

Should be safe to use

Answer

Impurities should crystallize along with the solute

Question 19

19. Premature crystallization of solution of filter paper or in funnel can be avoided

Answer

Filtering cold solution

Answer

Filling warm solution

Answer

Filtering hot saturated solution using hot funnel

Answer

Quick filtration

Question 20

20. Gooch crucible is used to filter the solution of

Answer

Under suction crucible

Question 21

21. One of the following does not sublime

Answer

Naphthalene

Question 22

22. Paper chromatography is a type

Answer

Partition chromatography

Answer

Absorption chromatography

Answer

Adsorption chromatography

Question 23

23. Rate of filtration through conical funnel can be considerably increased by using

Answer

Fluted filter

Answer

Fine filter paper

Answer

Ordinary filter paper

Answer

Under suction crucible

Question 24

24. The technique of chromatography is used in

Answer

Purification

Answer

Separation

Question 25

25. Aqueous solution of iodine is prepared first by dissolving which compound in water

Question 26

26. Solvent extraction is an equilibrium process and it is controlled by

Answer

Distribution law

Answer

Law of mass action

Answer

The amount of solute

Answer

The amount of solvent used

Question 27

27. A filtration process could be very time consuming if it were not aided by the gentle suction, which is developed

Answer

If the paper covers the funnel up to its circumference

Answer

If the paper has got small sized pores in it

Answer

If the stem of the funnel is large so that it dips into the filtrate

Answer

If the paper fits tightly

Question 28

28. After filtration slow cooling yields

Answer

Bigger & pure crystals

Answer

Bigger & impure crystals

Answer

Smaller & pure

Answer

Smaller & impure

Question 29

29. Which type of chromatography has fixed phase

Answer

None of these

Answer

Absorption

Question 30

30. Iodine-salt mixture can be separated through

Answer

Sublimation

Answer

Simple distillation

Answer

Simple filtration

Answer

Fractional distillation

Question 31

31. Which one of the following techniques can be used to separate NaC1 and sand?

Answer

Formation of solution and filtration

Answer

Sublimation

Answer

Chromatography

Answer

Formation of solution and evaporation

Question 32

32. Filtration through Gooch and sintered glass crucibles is aided by a gentle suction

Answer

For preparation of chemical compound

Answer

It dissolves a large amount of the substance

Answer

It should deposit well-formed crystals of the pure compound

Answer

Quick filtration can be done

Question 33

33. Which of the following technique is used for the separation of insoluble particles from liquids?

Answer

Filtration

Answer

Chromatography

Answer

Solvent extraction

Answer

Crystallization

Question 34

34. Examples of sublimate does not include

Answer

Naphthalene

Answer

Ammonium salts

Question 35

35. Solvent extraction method is used for compounds which are

Answer

Both A and B

Answer

Thermally unstable

Question 36

36. Chromatography is important in

Answer

Quantitative analysis

Answer

Qualitative analysis

Answer

Determination of purity

Answer

All of these

Question 37

37. Sintered crucible is made up of

Question 38

38. The dried paper containing pattern on paper is called

Answer

Chromatograph

Answer

Chromatogram

Answer

Chromophore

Question 39

39. Which of the following process is used to separate insoluble particles from liquids?

Answer

Crystallization

Answer

Filtration

Answer

Separation

Answer

Condensation

Question 40

40. Solvent extraction method is particularly useful technique for separation, when product to be separated is

Answer

Nonvolatile or thermally stable

Answer

Volatile or thermally stable

Answer

Non-volatile or thermally unstable

Answer

Non-volatile or thermally unstable

Question 41

41. Gooch crucible is used for the filtration of precipitates having

Answer

Low temperature

Answer

High solubility

Answer

High concentration

Answer

High ignition temperature

Question 42

42. An insoluble solid can be separated from a liquid by

Answer

Crystallization

Answer

Sublimation

Answer

Chromatography

Answer

Filtration

Question 43

43. A process controlled by distribution law is

Answer

Filtration

Answer

Sublimation

Answer

Crystallization

Answer

Solvent extraction

Question 44

44. The crystals are drying through a

Answer

Vacuum desiccator

Answer

Direct providing heat

Answer

Vacuum pump

Question 45

45. Condensed solid produced during sublimation is

Question 46

46. The solid which is left over the filter paper is called

Question 47

47. In paper chromatography the point at which the solvent rises to maximum extent is called

Answer

Solvent front

Answer

Chromatogram

Question 48

48. The iodine present in water can be separated by which one of the following techniques

Answer

Filtration

Answer

Sublimation

Answer

Solvent extraction

Answer

Chromatography

Question 49

49. The rate at which the solute moves in paper chromatography depends upon

Answer

Boiling point of solvent

Answer

Distribution law

Answer

Distribution coefficient

Answer

Low partial pressures

Question 50

50. Gooch crucible is used in a suction filtering apparatus, because

Answer

It is used to separate organic compounds from water

Answer

It is used for filtration of precipitates which need to be ignited

Answer

It keeps the stem of funnel full of liquid

Answer

A solid compound is purified

Question 51

51. Chromatography in which the stationary phase is liquid is called

Answer

Absorption chromatography

Answer

Partition chromatography

Answer

Adsorption chromatography

Question 52

52. Safe and most reliable method of drying the crystals is

Answer

Filter paper

Question 53

53. If the solvent is inflammable for heating purpose we use

Answer

Thermostat

Answer

Wire gauze

Answer

Water bath

Question 54

54. Which of the following is directly related to Qualitative analysis?

Answer

Measurement

Answer

Separation

Answer

Calculation

Answer

Identification

Question 55

55. Filtration by a glass funnel and filter paper is very

Answer

Time consuming

Question 56

56. The conversion of vapors directly into solid is called

Answer

Condensation

Answer

Sublimation

Question 57

57. A comparative rates at which the solutes move in the paper chromatography depends on

Answer

Their Rf values

Answer

Their partition coefficients

Answer

The size of paper used

Question 58

58. Safe and reliable method of drying crystal in through

Answer

Vacuum desiccator

Answer

Evaporation of solution

Answer

Drying it in oven

Answer

Pressing it between folds of filter paper

Question 59

59. When a solid which has high vapor pressure at a temperature below its boiling point, is heated it starts:

Answer

Decomposing

Answer

Sublimation

Answer

Condensing

Question 60

60. CaC1₂ ad P₂O₅ are used as

Answer

Reside agents

Answer

Deleting agents

Answer

Crystallizing agents

Answer

Drying agents

Question 61

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Total Questions:	60
Time Allowed:	30 Minutes
Total Marks:	60
How to Attempt Test:	Please choose the right Option in MCQ-type question.
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