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

Solvent extraction

Crystallization

Chromatography

Filtration

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

Thermostat

Wire gauze

Ice bath

Water bath

3. 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 tip of funnel should not touch the beaker

The filter paper should be small

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

High solubility

High concentration

Low temperature

High ignition temperature

5. The most common example of solvent extraction is

Ether

Naphthalene

Acetone

Chloroform

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

Crystallization does not involve heating

Avoided

Needed

Depends on temperature

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

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

If the paper fits tightly

If the paper has got small sized pores in it

If the paper covers the funnel up to its circumference

8. Solvent extraction method is used for compounds which are

Thermally unstable

None

Volatile

Both A and B

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

Mud

Residue

Crystal

Steel

10. Examples of sublimate does not include

Nitrates

Ammonium salts

Iodine

Naphthalene

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

Absorption chromatography

None

Partition chromatography

Adsorption chromatography

12. Chromatography is important in

Qualitative analysis

All of these

Quantitative analysis

Determination of purity

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

KC1

KBr

NaC1

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

Base line

Solvent front

Chromatogram

Event

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

Impurities should crystallize along with the solute

Should be expensive

It should react chemically with the solute

Should be safe to use

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

Distribution law

Boiling point of solvent

Low partial pressures

Distribution coefficient

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

Calculation

Separation

Identification

Measurement

18. Sintered crucible is made up of

Plastic

Glass

Filer

Porcelain

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

Size of the chromatographic tank used

The size of paper used

Temperature of the experiment

Rf values of solutes

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

Volatile or thermally stable

Non – volatile or thermally stable

Volatile or thermally unstable

Non – volatile or thermally unstable

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

Time consuming

Fast

Difficult

Accurate

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

80⁰

180⁰

90⁰

60⁰

23. Safe and reliable method of drying crystal in through

Vacuum desiccator

Pressing it between folds of filter paper

Evaporation of solution

Drying it in oven

24. Which one is not the drying agent

Phosphorus penta-oxide

Silica gel

Cacl₂

CaOCl

25. After filtration slow cooling yields

Bigger & pure crystals

Bigger & impure crystals

Smaller & pure

Smaller & impure

Page 2 of 3

26. The conversion of vapors directly into solid is called

Sublimation

Freezing

Condensation

None

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

Law of specific proportion

Distribution coefficients

Law of partial pressure

Distribution law

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

Sublimation

Crystallization

Chromatography

Filtration

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

Separation

Crystallization

Condensation

Filtration

30. The dried paper containing pattern on paper is called

Chromatograph

Chrome

Chromophore

Chromatogram

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

Formation of solution and evaporation

Formation of solution and filtration

Chromatography

Sublimation

32. 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

33. The technique of chromatography is used in

Separation

All

Isolation

Purification

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

Under suction crucible

Fluted filter

Fine filter paper

Ordinary filter paper

35. Which type of chromatography has fixed phase

None of these

Absorption

Partition

Gas

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

Amount of solute

Law of mass action

Amount of solute used

Distribution law

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

The amount of solvent used

The amount of solute

Law of mass action

Distribution law

38. Paper chromatography is a type

Partition chromatography

Absorption chromatography

None

Adsorption chromatography

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

Filtration

Solvent extraction

Sublimation

Chromatography

40. One of the following does not sublime

Iodine

Naphthalene

NH₄Cl

Wax

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

It keeps the stem of funnel full of liquid

It is used to separate organic compounds from water

A solid compound is purified

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

42. Condensed solid produced during sublimation is

Residue

Insoluble

Sublimate

Crystal

43. During the process of crystallization the hot saturated solution

Cooled at a moderate rate to get medium sized crystals

Evaporated to get the crystals of the product

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

Cooled very slowly to get large sized crystals

44. A process controlled by distribution law is

Crystallization

Filtration

Solvent extraction

Sublimation

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

Decomposing

Sublimation

Melting

Condensing

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

Filtration

Boiling

Solvent extraction

Sublimation

47. Sintered glass crucible is used for

Convenient filtration than that by Gooch crucible

To avoid premature crystallization of solute

Purification of slid

Separation of two miscible liquids

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

Nature of reactants

Nature of filter paper

Nature of reaction

Nature of precipitate

49. Gooch crucible is used to filter the solution of

KMnO4

Under suction crucible

KOH

K2Cr2O7

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

Their Rf values

Their partition coefficients

The size of paper used

Used

Page 3 of 3

51. The process of filtration is used to

Separate the two miscible liquids

Separate insoluble particles from liquids

Separate the two immiscible liquids

Separate solute from solution

52. Iodine-salt mixture can be separated through

Sublimation

Simple distillation

Fractional distillation

Simple filtration

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

Chloroform

Carbon tetrachloride

Ethanol

Acetic acid

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

Non-volatile or thermally unstable

Nonvolatile or thermally stable

Non-volatile or thermally unstable

Volatile or thermally stable

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

Desicator

Oven

None

Filter paper

56. The crystals are drying through a

Direct providing heat

Vacuum pump

None

Vacuum desiccator

57. CaC1₂ ad P₂O₅ are used as

Deleting agents

Reside agents

Crystallizing agents

Drying agents

58. 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

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

It dissolves a large amount of the substance

It should deposit well-formed crystals of the pure compound

For preparation of chemical compound

Quick filtration can be done

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

Nacl and Kcl

Sand and naphthalene

Sand and Nacl

Sand and broken pieces of glass

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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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