Chemistry Experimental Techniques Online Mcqs Test

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Question 1

1. The process of filtration is used to

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Separate solute from solution

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Separate the two immiscible liquids

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Separate insoluble particles from liquids

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Separate the two miscible liquids

Question 2

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

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Sublimation

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Condensing

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Decomposing

Question 3

3. During the process of crystallization the hot saturated solution

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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 very slowly to get large sized crystals

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Cooled at a moderate rate to get medium sized crystals

Question 4

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

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Sand and Nacl

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Sand and broken pieces of glass

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Nacl and Kcl

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Sand and naphthalene

Question 5

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

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Impurities should crystallize along with the solute

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Should be safe to use

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Should be expensive

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It should react chemically with the solute

Question 6

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

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Separation

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Identification

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Calculation

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Measurement

Question 7

7. Safe and reliable method of drying crystal in through

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Pressing it between folds of filter paper

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Drying it in oven

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Vacuum desiccator

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Evaporation of solution

Question 8

8. Chromatography is important in

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Qualitative analysis

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All of these

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Quantitative analysis

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Determination of purity

Question 9

9. Examples of sublimate does not include

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Naphthalene

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Ammonium salts

Question 10

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

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Filter paper

Question 11

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

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Amount of solute

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Amount of solute used

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Law of mass action

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Distribution law

Question 12

12. The technique of chromatography is used in

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Separation

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Purification

Question 13

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

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Separation

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Crystallization

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Condensation

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Filtration

Question 14

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

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Ordinary filter paper

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Under suction crucible

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Fluted filter

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Fine filter paper

Question 15

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

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Solvent extraction

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Filtration

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Sublimation

Answer

Chromatography

Question 16

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

Answer

Chromatography

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Crystallization

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Solvent extraction

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Filtration

Question 17

17. Condensed solid produced during sublimation is

Question 18

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

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Crystallization does not involve heating

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Depends on temperature

Question 19

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

Answer

Time consuming

Question 20

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

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Low partial pressures

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Distribution coefficient

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Distribution law

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Boiling point of solvent

Question 21

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

Answer

Water bath

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Wire gauze

Answer

Thermostat

Question 22

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

Question 23

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

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Volatile or thermally stable

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Volatile or thermally unstable

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Non – volatile or thermally stable

Answer

Non – volatile or thermally unstable

Question 24

24. Which type of chromatography has fixed phase

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None of these

Answer

Absorption

Question 25

25. The most common example of solvent extraction is

Answer

Naphthalene

Answer

Chloroform

Question 26

26. The crystals are drying through a

Answer

Vacuum desiccator

Answer

Vacuum pump

Answer

Direct providing heat

Question 27

27. Gooch crucible is used to filter the solution of

Answer

Under suction crucible

Question 28

28. After filtration slow cooling yields

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Smaller & pure

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Smaller & impure

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Bigger & impure crystals

Answer

Bigger & pure crystals

Question 29

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

Answer

Solvent extraction

Answer

Filtration

Answer

Sublimation

Question 30

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

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The size of paper used

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Their Rf values

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Their partition coefficients

Question 31

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

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Decomposition

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Sublimation

Answer

Crystallization

Answer

Evaporation

Question 32

32. One of the following does not sublime

Answer

Naphthalene

Question 33

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

Answer

Solvent front

Answer

Chromatogram

Question 34

34. A process controlled by distribution law is

Answer

Filtration

Answer

Solvent extraction

Answer

Sublimation

Answer

Crystallization

Question 35

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

Answer

Chloroform

Answer

Carbon tetrachloride

Answer

Acetic acid

Question 36

36. Iodine-salt mixture can be separated through

Answer

Sublimation

Answer

Simple filtration

Answer

Fractional distillation

Answer

Simple distillation

Question 37

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

Answer

Absorption chromatography

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Adsorption chromatography

Answer

Partition chromatography

Question 38

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

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Temperature of the experiment

Answer

Rf values of solutes

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The size of paper used

Answer

Size of the chromatographic tank used

Question 39

39. Sintered crucible is made up of

Question 40

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

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Filtering cold solution

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Quick filtration

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Filling warm solution

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Filtering hot saturated solution using hot funnel

Question 41

41. The dried paper containing pattern on paper is called

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Chromatogram

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Chromophore

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Chromatograph

Question 42

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

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Nature of reaction

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Nature of reactants

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Nature of filter paper

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Nature of precipitate

Question 43

43. CaC1₂ ad P₂O₅ are used as

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Deleting agents

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Crystallizing agents

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Drying agents

Answer

Reside agents

Question 44

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

Answer

Volatile or thermally stable

Answer

Non-volatile or thermally unstable

Answer

Non-volatile or thermally unstable

Answer

Nonvolatile or thermally stable

Question 45

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

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It should deposit well-formed crystals of the pure compound

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For preparation of chemical compound

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Quick filtration can be done

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It dissolves a large amount of the substance

Question 46

46. Which one is not the drying agent

Answer

Silica gel

Answer

Phosphorus penta-oxide

Question 47

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

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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 filter paper should be small

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The stem of the funnel should remain continuously full of liquids

Question 48

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

Answer

Distribution coefficients

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Distribution law

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Law of specific proportion

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Law of partial pressure

Question 49

49. 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 paper fits tightly

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

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If the paper covers the funnel up to its circumference

Question 50

50. Paper chromatography is a type

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Adsorption chromatography

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Partition chromatography

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Absorption chromatography

Question 51

51. 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 52

52. The conversion of vapors directly into solid is called

Answer

Condensation

Answer

Sublimation

Question 53

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

Question 54

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

Answer

High solubility

Answer

High concentration

Answer

High ignition temperature

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Low temperature

Question 55

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

Answer

Formation of solution and evaporation

Answer

Sublimation

Answer

Formation of solution and filtration

Answer

Chromatography

Question 56

56. Sintered glass crucible is used for

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Purification of slid

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Convenient filtration than that by Gooch crucible

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To avoid premature crystallization of solute

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Separation of two miscible liquids

Question 57

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

Question 58

58. Solvent extraction method is used for compounds which are

Answer

Thermally unstable

Answer

Both A and B

Question 59

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

Answer

Crystallization

Answer

Sublimation

Answer

Chromatography

Answer

Filtration

Question 60

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

Answer

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

Answer

It keeps the stem of funnel full of liquid

Answer

It is used to separate organic compounds from water

Answer

A solid compound is purified

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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