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ECAT Chemistry Experimental Techniques Test Online

Maan AliLast Updated: April 19, 2025

Chemistry Experimental Techniques MCQS Online Test

ECAT Chemistry Experimental Techniques Chapter Online Test

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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ECAT Chemistry Experimental Techniques Test

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Page 1 of 3

Chemistry

1. The technique of chromatography is used in

All

Separation

Purification

Isolation

2. The dried paper containing pattern on paper is called

Chromatograph

Chromophore

Chromatogram

Chrome

3. Gooch crucible is used to filter the solution of

K2Cr2O7

KMnO4

Under suction crucible

KOH

4. Sintered crucible is made up of

Plastic

Porcelain

Filer

Glass

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

Residue

Crystal

Steel

Mud

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

Fast

Time consuming

Difficult

Accurate

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

Boiling point of solvent

Distribution law

Low partial pressures

Distribution coefficient

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

Adsorption chromatography

Absorption chromatography

Partition chromatography

None

9. During the process of crystallization the hot saturated solution

Evaporated to get the crystals of the product

Cooled very slowly to get large sized crystals

Cooled at a moderate rate to get medium sized crystals

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

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

Impurities should crystallize along with the solute

It should react chemically with the solute

Should be expensive

Should be safe to use

11. Condensed solid produced during sublimation is

Residue

Sublimate

Crystal

Insoluble

12. CaC1₂ ad P₂O₅ are used as

Drying agents

Reside agents

Deleting agents

Crystallizing agents

13. Solvent extraction method is used for compounds which are

Both A and B

Thermally unstable

None

Volatile

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

Temperature of the experiment

Size of the chromatographic tank used

Rf values of solutes

The size of paper used

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

Nature of reactants

Nature of filter paper

Nature of reaction

Nature of precipitate

16. Iodine-salt mixture can be separated through

Fractional distillation

Simple filtration

Sublimation

Simple distillation

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

Non – volatile or thermally unstable

Non – volatile or thermally stable

Volatile or thermally stable

Volatile or thermally unstable

18. Which type of chromatography has fixed phase

Gas

Partition

None of these

Absorption

19. Safe and reliable method of drying crystal in through

Drying it in oven

Vacuum desiccator

Evaporation of solution

Pressing it between folds of filter paper

20. Chromatography is important in

Quantitative analysis

Determination of purity

All of these

Qualitative analysis

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

Filtering cold solution

Quick filtration

Filtering hot saturated solution using hot funnel

Filling warm solution

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

Separation

Condensation

Crystallization

Filtration

23. Sintered glass crucible is used for

Purification of slid

To avoid premature crystallization of solute

Convenient filtration than that by Gooch crucible

Separation of two miscible liquids

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

Decomposition

Crystallization

Sublimation

Evaporation

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

High concentration

High solubility

Low temperature

High ignition temperature

Page 2 of 3

26. The most common example of solvent extraction is

Naphthalene

Ether

Chloroform

Acetone

27. A process controlled by distribution law is

Sublimation

Crystallization

Filtration

Solvent extraction

28. Examples of sublimate does not include

Ammonium salts

Nitrates

Naphthalene

Iodine

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

Distribution law

Amount of solute used

Law of mass action

Amount of solute

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

The filter paper should be small

The stem of the funnel should remain continuously full of liquids

The tip of funnel should not touch the beaker

The stem of the funnel should be small

31. Which one is not the drying agent

Silica gel

Cacl₂

Phosphorus penta-oxide

CaOCl

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

Solvent extraction

Filtration

Chromatography

Crystallization

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

Base line

Solvent front

Event

Chromatogram

34. After filtration slow cooling yields

Bigger & impure crystals

Bigger & pure crystals

Smaller & impure

Smaller & pure

35. The process of filtration is used to

Separate the two immiscible liquids

Separate insoluble particles from liquids

Separate the two miscible liquids

Separate solute from solution

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

Quick filtration can be done

It should deposit well-formed crystals of the pure compound

It dissolves a large amount of the substance

For preparation of chemical compound

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

80⁰

180⁰

90⁰

60⁰

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

Non-volatile or thermally unstable

Nonvolatile or thermally stable

Volatile or thermally stable

Non-volatile or thermally unstable

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

Filter paper

None

Oven

Desicator

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

Ice bath

Water bath

Thermostat

Wire gauze

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

Law of mass action

The amount of solute

Distribution law

The amount of solvent used

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

Used

Their partition coefficients

Their Rf values

The size of paper used

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

Avoided

Depends on temperature

Crystallization does not involve heating

Needed

44. One of the following does not sublime

NH₄Cl

Wax

Iodine

Naphthalene

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

Decomposing

Melting

Sublimation

Condensing

46. The conversion of vapors directly into solid is called

Freezing

Condensation

None

Sublimation

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

Sand and naphthalene

Sand and Nacl

Sand and broken pieces of glass

Nacl and Kcl

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

Chromatography

Formation of solution and filtration

Formation of solution and evaporation

Sublimation

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

NaC1

KBr

KC1

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

It is used to separate organic compounds from water

It keeps the stem of funnel full of liquid

A solid compound is purified

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

Page 3 of 3

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

Sublimation

Chromatography

Filtration

Crystallization

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

Fine filter paper

Fluted filter

Under suction crucible

Ordinary filter paper

53. Paper chromatography is a type

Partition chromatography

Adsorption chromatography

None

Absorption chromatography

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

Sublimation

Filtration

Boiling

Solvent extraction

55. The crystals are drying through a

Direct providing heat

None

Vacuum desiccator

Vacuum pump

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

Distribution law

Law of specific proportion

Distribution coefficients

Law of partial pressure

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

Ethanol

Chloroform

Carbon tetrachloride

Acetic acid

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

Chromatography

Filtration

Sublimation

Solvent extraction

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

Separation

Identification

Measurement

Calculation

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

If the paper fits tightly

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

If the paper covers the funnel up to its circumference

If the paper has got small sized pores in it

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Maan AliLast Updated: April 19, 2025

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ECAT Chemistry Experimental Techniques Test Online

Chemistry Experimental Techniques MCQS Online Test

ECAT Chemistry Experimental Techniques Chapter Online Test

ECAT Chemistry Experimental Techniques Test

Chemistry

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Maan Ali

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Chemistry Experimental Techniques MCQS Online Test

ECAT Chemistry Experimental Techniques Chapter Online Test

ECAT Chemistry Experimental Techniques Test

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