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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. Filtration by a glass funnel and filter paper is very

Fast

Time consuming

Accurate

Difficult

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

Distribution law

Distribution coefficients

Law of specific proportion

Law of partial pressure

3. CaC1₂ ad P₂O₅ are used as

Reside agents

Deleting agents

Crystallizing agents

Drying agents

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

Sublimation

Solvent extraction

Boiling

Filtration

5. The crystals are drying through a

None

Direct providing heat

Vacuum pump

Vacuum desiccator

6. Which type of chromatography has fixed phase

Partition

Absorption

None of these

Gas

7. During the process of crystallization the hot saturated solution

Cooled very slowly to get large sized crystals

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

Cooled at a moderate rate to get medium sized crystals

Evaporated to get the crystals of the product

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

Mud

Crystal

Residue

Steel

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

It keeps the stem of funnel full of liquid

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

It is used to separate organic compounds from water

A solid compound is purified

10. A process controlled by distribution law is

Sublimation

Crystallization

Solvent extraction

Filtration

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

Their Rf values

Their partition coefficients

Used

The size of paper used

12. Iodine-salt mixture can be separated through

Fractional distillation

Simple distillation

Simple filtration

Sublimation

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

Water bath

Wire gauze

Ice bath

Thermostat

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

Decomposition

Sublimation

Crystallization

Evaporation

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

Solvent extraction

Filtration

Chromatography

Crystallization

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

Chromatography

Formation of solution and evaporation

Sublimation

Formation of solution and filtration

17. After filtration slow cooling yields

Bigger & pure crystals

Smaller & pure

Bigger & impure crystals

Smaller & impure

18. Examples of sublimate does not include

Iodine

Naphthalene

Ammonium salts

Nitrates

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

If the paper covers the funnel up to its circumference

If the paper has got small sized pores in it

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

If the paper fits tightly

20. Safe and reliable method of drying crystal in through

Evaporation of solution

Drying it in oven

Pressing it between folds of filter paper

Vacuum desiccator

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

High ignition temperature

Low temperature

High solubility

High concentration

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

Distribution coefficient

Boiling point of solvent

Distribution law

Low partial pressures

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

Filtration

Condensation

Crystallization

Separation

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

Quick filtration can be done

It dissolves a large amount of the substance

It should deposit well-formed crystals of the pure compound

For preparation of chemical compound

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

Nature of reaction

Nature of precipitate

Nature of reactants

Nature of filter paper

Page 2 of 3

26. The conversion of vapors directly into solid is called

Sublimation

None

Freezing

Condensation

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

Base line

Chromatogram

Solvent front

Event

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

None

Desicator

Filter paper

Oven

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

Distribution law

The amount of solute

The amount of solvent used

Law of mass action

30. 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

31. One of the following does not sublime

NH₄Cl

Naphthalene

Iodine

Wax

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

Volatile or thermally unstable

Non – volatile or thermally stable

Volatile or thermally stable

Non – volatile or thermally unstable

33. Sintered crucible is made up of

Porcelain

Glass

Plastic

Filer

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

Partition chromatography

None

Absorption chromatography

Adsorption chromatography

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

Solvent extraction

Chromatography

Filtration

Sublimation

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

Carbon tetrachloride

Acetic acid

Chloroform

Ethanol

37. The dried paper containing pattern on paper is called

Chrome

Chromatogram

Chromatograph

Chromophore

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

Chromatography

Filtration

Crystallization

Sublimation

39. Sintered glass crucible is used for

To avoid premature crystallization of solute

Purification of slid

Convenient filtration than that by Gooch crucible

Separation of two miscible liquids

40. The technique of chromatography is used in

Isolation

Purification

All

Separation

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

Filling warm solution

Quick filtration

Filtering cold solution

Filtering hot saturated solution using hot funnel

42. Paper chromatography is a type

Absorption chromatography

Partition chromatography

None

Adsorption chromatography

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

Sand and broken pieces of glass

Sand and naphthalene

Nacl and Kcl

Sand and Nacl

44. The most common example of solvent extraction is

Naphthalene

Ether

Acetone

Chloroform

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

Separation

Identification

Calculation

Measurement

46. Which one is not the drying agent

Silica gel

CaOCl

Phosphorus penta-oxide

Cacl₂

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

Temperature of the experiment

The size of paper used

Size of the chromatographic tank used

Rf values of solutes

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

The stem of the funnel should be small

The stem of the funnel should remain continuously full of liquids

The filter paper should be small

The tip of funnel should not touch the beaker

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

80⁰

180⁰

60⁰

90⁰

50. Condensed solid produced during sublimation is

Sublimate

Residue

Insoluble

Crystal

Page 3 of 3

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

Avoided

Crystallization does not involve heating

Depends on temperature

Needed

52. Gooch crucible is used to filter the solution of

KOH

KMnO4

Under suction crucible

K2Cr2O7

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

KBr

NaC1

KC1

54. Solvent extraction method is used for compounds which are

Thermally unstable

Volatile

None

Both A and B

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

Impurities should crystallize along with the solute

Should be safe to use

It should react chemically with the solute

Should be expensive

56. The process of filtration is used to

Separate the two immiscible liquids

Separate the two miscible liquids

Separate solute from solution

Separate insoluble particles from liquids

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

Amount of solute

Law of mass action

Distribution law

Amount of solute used

58. Chromatography is important in

Quantitative analysis

Determination of purity

Qualitative analysis

All of these

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

Fine filter paper

Under suction crucible

Fluted filter

Ordinary filter paper

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

Decomposing

Melting

Condensing

Sublimation

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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

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