Chemistry Experimental Techniques Online Mcqs Test

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Question 1

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

Answer

Filtration

Answer

Solvent extraction

Answer

Sublimation

Question 2

2. 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 3

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

Answer

Under suction crucible

Answer

Ordinary filter paper

Answer

Fluted filter

Answer

Fine filter paper

Question 4

4. The most common example of solvent extraction is

Answer

Chloroform

Answer

Naphthalene

Question 5

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

Question 6

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

Answer

Nature of filter paper

Answer

Nature of reaction

Answer

Nature of reactants

Answer

Nature of precipitate

Question 7

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

Answer

Filter paper

Question 8

8. The crystals are drying through a

Answer

Direct providing heat

Answer

Vacuum pump

Answer

Vacuum desiccator

Question 9

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

Answer

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

Answer

A solid compound is purified

Answer

It keeps the stem of funnel full of liquid

Answer

It is used to separate organic compounds from water

Question 10

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

Answer

Amount of solute

Answer

Amount of solute used

Answer

Distribution law

Answer

Law of mass action

Question 11

11. During the process of crystallization the hot saturated solution

Answer

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

Answer

Evaporated to get the crystals of the product

Answer

Cooled very slowly to get large sized crystals

Answer

Cooled at a moderate rate to get medium sized crystals

Question 12

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

Answer

Formation of solution and filtration

Answer

Formation of solution and evaporation

Answer

Sublimation

Answer

Chromatography

Question 13

13. Solvent extraction method is used for compounds which are

Answer

Thermally unstable

Answer

Both A and B

Question 14

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

Answer

Filtration

Answer

Sublimation

Answer

Crystallization

Answer

Chromatography

Question 15

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

Answer

Non-volatile or thermally unstable

Answer

Non-volatile or thermally unstable

Answer

Nonvolatile or thermally stable

Answer

Volatile or thermally stable

Question 16

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

Answer

Thermostat

Answer

Water bath

Answer

Wire gauze

Question 17

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

Answer

High ignition temperature

Answer

Low temperature

Answer

High concentration

Answer

High solubility

Question 18

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

Answer

Non – volatile or thermally stable

Answer

Volatile or thermally unstable

Answer

Volatile or thermally stable

Answer

Non – volatile or thermally unstable

Question 19

19. The dried paper containing pattern on paper is called

Answer

Chromatogram

Answer

Chromatograph

Answer

Chromophore

Question 20

20. The process of filtration is used to

Answer

Separate insoluble particles from liquids

Answer

Separate solute from solution

Answer

Separate the two immiscible liquids

Answer

Separate the two miscible liquids

Question 21

21. Safe and reliable method of drying crystal in through

Answer

Evaporation of solution

Answer

Pressing it between folds of filter paper

Answer

Drying it in oven

Answer

Vacuum desiccator

Question 22

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

Question 23

23. Examples of sublimate does not include

Answer

Naphthalene

Answer

Ammonium salts

Question 24

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

Answer

It should react chemically with the solute

Answer

Impurities should crystallize along with the solute

Answer

Should be expensive

Answer

Should be safe to use

Question 25

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

Answer

Size of the chromatographic tank used

Answer

The size of paper used

Answer

Temperature of the experiment

Answer

Rf values of solutes

Question 26

26. Sintered crucible is made up of

Question 27

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

Answer

Solvent front

Answer

Chromatogram

Question 28

28. One of the following does not sublime

Answer

Naphthalene

Question 29

29. Condensed solid produced during sublimation is

Question 30

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

Answer

Distribution law

Answer

Boiling point of solvent

Answer

Distribution coefficient

Answer

Low partial pressures

Question 31

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

Answer

Chloroform

Answer

Acetic acid

Answer

Carbon tetrachloride

Question 32

32. Chromatography is important in

Answer

Determination of purity

Answer

Quantitative analysis

Answer

All of these

Answer

Qualitative analysis

Question 33

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

Answer

Evaporation

Answer

Crystallization

Answer

Decomposition

Answer

Sublimation

Question 34

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

Answer

If the paper fits tightly

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

Question 35

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

Question 36

36. Gooch crucible is used to filter the solution of

Answer

Under suction crucible

Question 37

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

Answer

The amount of solvent used

Answer

Distribution law

Answer

The amount of solute

Answer

Law of mass action

Question 38

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

Answer

Sublimation

Answer

Chromatography

Answer

Solvent extraction

Answer

Filtration

Question 39

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

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

Answer

For preparation of chemical compound

Question 40

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

Answer

Law of partial pressure

Answer

Distribution law

Answer

Law of specific proportion

Answer

Distribution coefficients

Question 41

41. Which type of chromatography has fixed phase

Answer

Absorption

Answer

None of these

Question 42

42. A process controlled by distribution law is

Answer

Filtration

Answer

Sublimation

Answer

Solvent extraction

Answer

Crystallization

Question 43

43. Iodine-salt mixture can be separated through

Answer

Simple distillation

Answer

Simple filtration

Answer

Sublimation

Answer

Fractional distillation

Question 44

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

Answer

Chromatography

Answer

Solvent extraction

Answer

Filtration

Answer

Crystallization

Question 45

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

Answer

Absorption chromatography

Answer

Partition chromatography

Answer

Adsorption chromatography

Question 46

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

Answer

The tip of funnel should not touch the beaker

Answer

The stem of the funnel should be small

Answer

The stem of the funnel should remain continuously full of liquids

Answer

The filter paper should be small

Question 47

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

Answer

Nacl and Kcl

Answer

Sand and broken pieces of glass

Answer

Sand and naphthalene

Answer

Sand and Nacl

Question 48

48. The technique of chromatography is used in

Answer

Separation

Answer

Purification

Question 49

49. After filtration slow cooling yields

Answer

Smaller & impure

Answer

Bigger & pure crystals

Answer

Bigger & impure crystals

Answer

Smaller & pure

Question 50

50. Paper chromatography is a type

Answer

Adsorption chromatography

Answer

Partition chromatography

Answer

Absorption chromatography

Question 51

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

Answer

Depends on temperature

Answer

Crystallization does not involve heating

Question 52

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

Answer

Filtering cold solution

Answer

Filling warm solution

Answer

Quick filtration

Answer

Filtering hot saturated solution using hot funnel

Question 53

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

Answer

Time consuming

Question 54

54. The conversion of vapors directly into solid is called

Answer

Sublimation

Answer

Condensation

Question 55

55. 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 56

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

Answer

Condensation

Answer

Crystallization

Answer

Separation

Answer

Filtration

Question 57

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

Answer

Calculation

Answer

Measurement

Answer

Separation

Answer

Identification

Question 58

58. Sintered glass crucible is used for

Answer

Purification of slid

Answer

Convenient filtration than that by Gooch crucible

Answer

Separation of two miscible liquids

Answer

To avoid premature crystallization of solute

Question 59

59. CaC1₂ ad P₂O₅ are used as

Answer

Crystallizing agents

Answer

Deleting agents

Answer

Drying agents

Answer

Reside agents

Question 60

60. Which one is not the drying agent

Answer

Phosphorus penta-oxide

Answer

Silica gel

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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