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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

Separation

All

Isolation

Purification

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

Crystallization

Separation

Filtration

Condensation

3. 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

4. Safe and reliable method of drying crystal in through

Pressing it between folds of filter paper

Vacuum desiccator

Drying it in oven

Evaporation of solution

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

Sublimation

Boiling

Solvent extraction

Filtration

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

NaC1

KBr

KC1

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

Used

Their Rf values

Their partition coefficients

The size of paper used

8. Sintered crucible is made up of

Filer

Glass

Plastic

Porcelain

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

Chromatogram

Event

Base line

Solvent front

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

Water bath

Ice bath

Thermostat

Wire gauze

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

Sand and Nacl

Nacl and Kcl

Sand and naphthalene

Sand and broken pieces of glass

12. A process controlled by distribution law is

Sublimation

Solvent extraction

Filtration

Crystallization

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

Filling warm solution

Filtering hot saturated solution using hot funnel

Filtering cold solution

Quick filtration

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

Should be expensive

Should be safe to use

It should react chemically with the solute

Impurities should crystallize along with the solute

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

Ethanol

Acetic acid

Chloroform

Carbon tetrachloride

16. The conversion of vapors directly into solid is called

Condensation

None

Sublimation

Freezing

17. During the process of crystallization the hot saturated solution

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

Cooled at a moderate rate to get medium sized crystals

Cooled very slowly to get large sized crystals

Evaporated to get the crystals of the product

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

Boiling point of solvent

Low partial pressures

Distribution coefficient

Distribution law

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

Temperature of the experiment

Rf values of solutes

Size of the chromatographic tank used

The size of paper used

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

Crystal

Residue

Mud

Steel

21. Which one is not the drying agent

Phosphorus penta-oxide

CaOCl

Cacl₂

Silica gel

22. One of the following does not sublime

Naphthalene

NH₄Cl

Iodine

Wax

23. The crystals are drying through a

None

Vacuum pump

Vacuum desiccator

Direct providing heat

24. Paper chromatography is a type

Partition chromatography

Absorption chromatography

Adsorption chromatography

None

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

It dissolves a large amount of the substance

For preparation of chemical compound

It should deposit well-formed crystals of the pure compound

Quick filtration can be done

Page 2 of 3

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

60⁰

180⁰

80⁰

90⁰

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

Distribution law

Law of partial pressure

Distribution coefficients

Law of specific proportion

28. 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 unstable

Volatile or thermally stable

29. Chromatography is important in

Quantitative analysis

Determination of purity

All of these

Qualitative analysis

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

Chromatography

Filtration

Sublimation

Solvent extraction

31. Solvent extraction method is used for compounds which are

Both A and B

Thermally unstable

None

Volatile

32. 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 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

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

Law of mass action

Amount of solute

Distribution law

Amount of solute used

34. The most common example of solvent extraction is

Naphthalene

Acetone

Chloroform

Ether

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

A solid compound is purified

It keeps the stem of funnel full of liquid

It is used to separate organic compounds from water

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

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

Needed

Avoided

Crystallization does not involve heating

Depends on temperature

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

Difficult

Time consuming

Fast

Accurate

38. Sintered glass crucible is used for

Convenient filtration than that by Gooch crucible

Separation of two miscible liquids

Purification of slid

To avoid premature crystallization of solute

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

Crystallization

Sublimation

Evaporation

Decomposition

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

Distribution law

Law of mass action

The amount of solute

The amount of solvent used

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

Filtration

Sublimation

Crystallization

Chromatography

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

Non-volatile or thermally unstable

Volatile or thermally stable

Non-volatile or thermally unstable

Nonvolatile or thermally stable

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

Absorption chromatography

Partition chromatography

Adsorption chromatography

None

44. Iodine-salt mixture can be separated through

Simple distillation

Sublimation

Fractional distillation

Simple filtration

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

Fluted filter

Ordinary filter paper

Fine filter paper

Under suction crucible

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

The filter paper should be small

The tip of funnel should not touch the beaker

The stem of the funnel should remain continuously full of liquids

The stem of the funnel should be small

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

Separation

Calculation

Identification

Measurement

48. Gooch crucible is used to filter the solution of

K2Cr2O7

Under suction crucible

KOH

KMnO4

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

Condensing

Melting

Sublimation

Decomposing

50. Examples of sublimate does not include

Ammonium salts

Naphthalene

Iodine

Nitrates

Page 3 of 3

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

Oven

None

Desicator

Filter paper

52. Which type of chromatography has fixed phase

Partition

Gas

Absorption

None of these

53. CaC1₂ ad P₂O₅ are used as

Crystallizing agents

Drying agents

Reside agents

Deleting agents

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

Chromatography

Crystallization

Solvent extraction

Filtration

55. The process of filtration is used to

Separate the two miscible liquids

Separate the two immiscible liquids

Separate solute from solution

Separate insoluble particles from liquids

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

Nature of filter paper

Nature of precipitate

Nature of reaction

Nature of reactants

57. After filtration slow cooling yields

Bigger & impure crystals

Smaller & impure

Bigger & pure crystals

Smaller & pure

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

High solubility

Low temperature

High concentration

High ignition temperature

59. Condensed solid produced during sublimation is

Sublimate

Residue

Insoluble

Crystal

60. The dried paper containing pattern on paper is called

Chrome

Chromatogram

Chromophore

Chromatograph

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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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