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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 rate at which the solute moves in paper chromatography depends upon

Boiling point of solvent

Distribution coefficient

Low partial pressures

Distribution law

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

Measurement

Separation

Identification

Calculation

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

Nonvolatile or thermally stable

Non-volatile or thermally unstable

Volatile or thermally stable

Non-volatile or thermally unstable

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

Their partition coefficients

The size of paper used

Used

Their Rf values

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

Partition chromatography

Absorption chromatography

None

Adsorption chromatography

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

Law of partial pressure

Distribution coefficients

Distribution law

Law of specific proportion

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

Nature of precipitate

Nature of reactants

Nature of reaction

Nature of filter paper

8. After filtration slow cooling yields

Bigger & impure crystals

Smaller & impure

Bigger & pure crystals

Smaller & pure

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

NaC1

KBr

KC1

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

Mud

Steel

Residue

Crystal

11. A process controlled by distribution law is

Solvent extraction

Sublimation

Crystallization

Filtration

12. Condensed solid produced during sublimation is

Sublimate

Crystal

Residue

Insoluble

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

The stem of the funnel should remain continuously full of liquids

The filter paper should be small

The stem of the funnel should be small

The tip of funnel should not touch the beaker

14. Gooch crucible is used to filter the solution of

K2Cr2O7

KMnO4

KOH

Under suction crucible

15. One of the following does not sublime

Naphthalene

Iodine

Wax

NH₄Cl

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

Crystallization

Solvent extraction

Filtration

Chromatography

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

Filtering cold solution

Quick filtration

Filling warm solution

Filtering hot saturated solution using hot funnel

18. The process of filtration is used to

Separate the two miscible liquids

Separate the two immiscible liquids

Separate insoluble particles from liquids

Separate solute from solution

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

Crystallization does not involve heating

Avoided

Depends on temperature

Needed

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

Formation of solution and evaporation

Formation of solution and filtration

Sublimation

Chromatography

21. Examples of sublimate does not include

Nitrates

Ammonium salts

Naphthalene

Iodine

22. Paper chromatography is a type

Adsorption chromatography

Partition chromatography

None

Absorption chromatography

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

Sublimation

Decomposing

Melting

Condensing

24. The conversion of vapors directly into solid is called

Condensation

Sublimation

Freezing

None

25. 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

Non – volatile or thermally unstable

Volatile or thermally unstable

Page 2 of 3

26. The technique of chromatography is used in

Isolation

All

Purification

Separation

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

Filtration

Boiling

Sublimation

Solvent extraction

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

Acetic acid

Carbon tetrachloride

Chloroform

Ethanol

29. Chromatography is important in

Qualitative analysis

All of these

Determination of purity

Quantitative analysis

30. The crystals are drying through a

None

Vacuum pump

Vacuum desiccator

Direct providing heat

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

Ice bath

Thermostat

Wire gauze

Water bath

32. Sintered glass crucible is used for

Purification of slid

To avoid premature crystallization of solute

Separation of two miscible liquids

Convenient filtration than that by Gooch crucible

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

Solvent front

Chromatogram

Event

Base line

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

Oven

Filter paper

None

Desicator

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

80⁰

60⁰

90⁰

180⁰

36. 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 covers the funnel up to its circumference

If the paper has got small sized pores in it

If the paper fits tightly

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

Sand and Nacl

Sand and broken pieces of glass

Sand and naphthalene

Nacl and Kcl

38. The dried paper containing pattern on paper is called

Chrome

Chromatogram

Chromatograph

Chromophore

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

Chromatography

Sublimation

Solvent extraction

Filtration

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

Law of mass action

Distribution law

Amount of solute used

Amount of solute

41. Which one is not the drying agent

Silica gel

Phosphorus penta-oxide

Cacl₂

CaOCl

42. CaC1₂ ad P₂O₅ are used as

Crystallizing agents

Reside agents

Deleting agents

Drying agents

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

It should deposit well-formed crystals of the pure compound

For preparation of chemical compound

It dissolves a large amount of the substance

Quick filtration can be done

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

It keeps the stem of funnel full of liquid

A solid compound is purified

It is used to separate organic compounds from water

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

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

Rf values of solutes

Size of the chromatographic tank used

Temperature of the experiment

The size of paper used

46. Which type of chromatography has fixed phase

Partition

None of these

Gas

Absorption

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

Sublimation

Crystallization

Chromatography

Filtration

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

Sublimation

Evaporation

Decomposition

Crystallization

49. Iodine-salt mixture can be separated through

Fractional distillation

Simple distillation

Sublimation

Simple filtration

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

It should react chemically with the solute

Should be expensive

Impurities should crystallize along with the solute

Should be safe to use

Page 3 of 3

51. Solvent extraction method is used for compounds which are

Thermally unstable

Both A and B

None

Volatile

52. The most common example of solvent extraction is

Acetone

Naphthalene

Chloroform

Ether

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

Distribution law

The amount of solvent used

The amount of solute

Law of mass action

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

Fast

Difficult

Time consuming

Accurate

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

Crystallization

Filtration

Separation

Condensation

56. 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

Cooled very slowly to get large sized crystals

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

57. Sintered crucible is made up of

Filer

Plastic

Glass

Porcelain

58. 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

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

Ordinary filter paper

Fluted filter

Fine filter paper

Under suction crucible

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

Low temperature

High ignition temperature

High concentration

High solubility

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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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