Chemistry Experimental Techniques Online Mcqs Test

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Question 1

1. The conversion of vapors directly into solid is called

Answer

Condensation

Answer

Sublimation

Question 2

2. During the process of crystallization the hot saturated solution

Answer

Cooled very slowly to get large sized crystals

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Evaporated to get the crystals of the product

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

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Cooled at a moderate rate to get medium sized crystals

Question 3

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

Question 4

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

Answer

It is used to separate organic compounds from water

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

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A solid compound is purified

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It keeps the stem of funnel full of liquid

Question 5

5. The dried paper containing pattern on paper is called

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Chromatograph

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Chromatogram

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Chromophore

Question 6

6. Sintered glass crucible is used for

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To avoid premature crystallization of solute

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Purification of slid

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Separation of two miscible liquids

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Convenient filtration than that by Gooch crucible

Question 7

7. CaC1₂ ad P₂O₅ are used as

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Reside agents

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Drying agents

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Deleting agents

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Crystallizing agents

Question 8

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

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If the paper has got small sized pores in it

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

Answer

If the paper covers the funnel up to its circumference

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If the paper fits tightly

Question 9

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

Answer

Chromatography

Answer

Filtration

Answer

Crystallization

Answer

Sublimation

Question 10

10. Examples of sublimate does not include

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Ammonium salts

Answer

Naphthalene

Question 11

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

Question 12

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

Answer

Temperature of the experiment

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Rf values of solutes

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The size of paper used

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Size of the chromatographic tank used

Question 13

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

Answer

Chromatography

Answer

Sublimation

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Formation of solution and filtration

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Formation of solution and evaporation

Question 14

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

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Boiling point of solvent

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Distribution law

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Low partial pressures

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Distribution coefficient

Question 15

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

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Non-volatile or thermally unstable

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Volatile or thermally stable

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Non-volatile or thermally unstable

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Nonvolatile or thermally stable

Question 16

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

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Depends on temperature

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Crystallization does not involve heating

Question 17

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

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The amount of solute

Answer

The amount of solvent used

Answer

Distribution law

Answer

Law of mass action

Question 18

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

Answer

Solvent front

Answer

Chromatogram

Question 19

19. Paper chromatography is a type

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Adsorption chromatography

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Absorption chromatography

Answer

Partition chromatography

Question 20

20. The technique of chromatography is used in

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Purification

Answer

Separation

Question 21

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

Answer

Chromatography

Answer

Filtration

Answer

Solvent extraction

Answer

Sublimation

Question 22

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

Answer

Acetic acid

Answer

Carbon tetrachloride

Answer

Chloroform

Question 23

23. Which type of chromatography has fixed phase

Answer

None of these

Answer

Absorption

Question 24

24. Iodine-salt mixture can be separated through

Answer

Sublimation

Answer

Fractional distillation

Answer

Simple filtration

Answer

Simple distillation

Question 25

25. After filtration slow cooling yields

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Bigger & impure crystals

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Smaller & impure

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Smaller & pure

Answer

Bigger & pure crystals

Question 26

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

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The filter paper should be small

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The stem of the funnel should be small

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The tip of funnel should not touch the beaker

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The stem of the funnel should remain continuously full of liquids

Question 27

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

Answer

Separation

Answer

Crystallization

Answer

Condensation

Answer

Filtration

Question 28

28. Which one is not the drying agent

Answer

Silica gel

Answer

Phosphorus penta-oxide

Question 29

29. Chromatography is important in

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Determination of purity

Answer

Quantitative analysis

Answer

All of these

Answer

Qualitative analysis

Question 30

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

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Impurities should crystallize along with the solute

Answer

It should react chemically with the solute

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Should be safe to use

Answer

Should be expensive

Question 31

31. 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 32

32. A process controlled by distribution law is

Answer

Filtration

Answer

Sublimation

Answer

Crystallization

Answer

Solvent extraction

Question 33

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

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For preparation of chemical compound

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It dissolves a large amount of the substance

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Quick filtration can be done

Answer

It should deposit well-formed crystals of the pure compound

Question 34

34. Solvent extraction method is used for compounds which are

Answer

Thermally unstable

Answer

Both A and B

Question 35

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

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Time consuming

Question 36

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

Answer

Sublimation

Answer

Decomposing

Answer

Condensing

Question 37

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

Answer

Filtration

Answer

Sublimation

Answer

Solvent extraction

Question 38

38. Sintered crucible is made up of

Question 39

39. Safe and reliable method of drying crystal in through

Answer

Pressing it between folds of filter paper

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Evaporation of solution

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Drying it in oven

Answer

Vacuum desiccator

Question 40

40. One of the following does not sublime

Answer

Naphthalene

Question 41

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

Answer

Distribution law

Answer

Law of partial pressure

Answer

Distribution coefficients

Answer

Law of specific proportion

Question 42

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

Answer

Evaporation

Answer

Sublimation

Answer

Decomposition

Answer

Crystallization

Question 43

43. The process of filtration is used to

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Separate the two miscible liquids

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Separate the two immiscible liquids

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Separate solute from solution

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Separate insoluble particles from liquids

Question 44

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

Answer

Fluted filter

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Ordinary filter paper

Answer

Fine filter paper

Answer

Under suction crucible

Question 45

45. The most common example of solvent extraction is

Answer

Chloroform

Answer

Naphthalene

Question 46

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

Answer

Filling warm solution

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Quick filtration

Answer

Filtering cold solution

Answer

Filtering hot saturated solution using hot funnel

Question 47

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

Answer

Partition chromatography

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Adsorption chromatography

Answer

Absorption chromatography

Question 48

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

Question 49

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

Answer

Nature of reactants

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Nature of reaction

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Nature of precipitate

Answer

Nature of filter paper

Question 50

50. Gooch crucible is used to filter the solution of

Answer

Under suction crucible

Question 51

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

Answer

Water bath

Answer

Wire gauze

Answer

Thermostat

Question 52

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

Answer

High solubility

Answer

Low temperature

Answer

High ignition temperature

Answer

High concentration

Question 53

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

Answer

Solvent extraction

Answer

Filtration

Answer

Chromatography

Answer

Crystallization

Question 54

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

Answer

Their Rf values

Answer

The size of paper used

Answer

Their partition coefficients

Question 55

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

Answer

Separation

Answer

Measurement

Answer

Calculation

Answer

Identification

Question 56

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

Answer

Filter paper

Question 57

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

Answer

Volatile or thermally stable

Answer

Volatile or thermally unstable

Answer

Non – volatile or thermally stable

Answer

Non – volatile or thermally unstable

Question 58

58. The crystals are drying through a

Answer

Direct providing heat

Answer

Vacuum pump

Answer

Vacuum desiccator

Question 59

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

Answer

Amount of solute

Answer

Law of mass action

Answer

Distribution law

Answer

Amount of solute used

Question 60

60. Condensed solid produced during sublimation is

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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Important Chemistry Experimental Techniques Question and Answer

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