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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. An insoluble solid can be separated from a liquid by

Sublimation

Filtration

Crystallization

Chromatography

2. Gooch crucible is used to filter the solution of

KOH

KMnO4

K2Cr2O7

Under suction crucible

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

Formation of solution and evaporation

Chromatography

Sublimation

Formation of solution and filtration

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

Fine filter paper

Fluted filter

Ordinary filter paper

Under suction crucible

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

It should react chemically with the solute

Impurities should crystallize along with the solute

Should be expensive

Should be safe to use

6. Condensed solid produced during sublimation is

Insoluble

Residue

Sublimate

Crystal

7. The dried paper containing pattern on paper is called

Chrome

Chromophore

Chromatogram

Chromatograph

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

Time consuming

Accurate

Difficult

Fast

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

Crystallization

Decomposition

Sublimation

Evaporation

10. The process of filtration is used to

Separate the two miscible liquids

Separate solute from solution

Separate insoluble particles from liquids

Separate the two immiscible liquids

11. The most common example of solvent extraction is

Ether

Acetone

Naphthalene

Chloroform

12. During the process of crystallization the hot saturated solution

Cooled at a moderate rate to get medium sized crystals

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

Evaporated to get the crystals of the product

Cooled very slowly to get large sized crystals

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

The stem of the funnel should be small

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

14. Solvent extraction method is used for compounds which are

None

Volatile

Thermally unstable

Both A and B

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

Chloroform

Ethanol

Carbon tetrachloride

Acetic acid

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

Volatile or thermally stable

Non – volatile or thermally unstable

Volatile or thermally unstable

Non – volatile or thermally stable

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

Ice bath

Water bath

Thermostat

Wire gauze

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

None

Absorption chromatography

Adsorption chromatography

Partition chromatography

19. A process controlled by distribution law is

Filtration

Solvent extraction

Crystallization

Sublimation

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

Distribution coefficient

Distribution law

Low partial pressures

Boiling point of solvent

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

Oven

Desicator

Filter paper

None

22. After filtration slow cooling yields

Smaller & pure

Bigger & pure crystals

Smaller & impure

Bigger & impure crystals

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

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

If the paper covers the funnel up to its circumference

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

Rf values of solutes

Temperature of the experiment

The size of paper used

Size of the chromatographic tank used

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

180⁰

80⁰

60⁰

90⁰

Page 2 of 3

26. Iodine-salt mixture can be separated through

Sublimation

Simple distillation

Fractional distillation

Simple filtration

27. Paper chromatography is a type

Adsorption chromatography

None

Partition chromatography

Absorption chromatography

28. 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

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

Sublimation

Melting

Decomposing

Condensing

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

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

It keeps the stem of funnel full of liquid

31. The technique of chromatography is used in

Purification

Separation

Isolation

All

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

Filtering cold solution

Filtering hot saturated solution using hot funnel

Filling warm solution

Quick filtration

33. Chromatography is important in

Quantitative analysis

Qualitative analysis

Determination of purity

All of these

34. The crystals are drying through a

Vacuum desiccator

Vacuum pump

Direct providing heat

None

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

Law of mass action

Amount of solute used

Amount of solute

Distribution law

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

Sublimation

Boiling

Solvent extraction

Filtration

37. 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

38. Which one is not the drying agent

Silica gel

Phosphorus penta-oxide

Cacl₂

CaOCl

39. 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

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

Filtration

Solvent extraction

Chromatography

Sublimation

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

NaC1

KBr

KC1

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

Condensation

Crystallization

Separation

Filtration

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

Separation

Identification

Calculation

Measurement

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

Event

Solvent front

Base line

Chromatogram

45. Sintered glass crucible is used for

To avoid premature crystallization of solute

Purification of slid

Separation of two miscible liquids

Convenient filtration than that by Gooch crucible

46. 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

47. CaC1₂ ad P₂O₅ are used as

Reside agents

Crystallizing agents

Drying agents

Deleting agents

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

Mud

Residue

Steel

Crystal

49. Examples of sublimate does not include

Nitrates

Iodine

Ammonium salts

Naphthalene

50. Which type of chromatography has fixed phase

Absorption

Gas

None of these

Partition

Page 3 of 3

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

Avoided

Needed

Crystallization does not involve heating

Depends on temperature

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

Nature of reactants

Nature of precipitate

Nature of filter paper

Nature of reaction

53. 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

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

Law of mass action

The amount of solute

The amount of solvent used

Distribution law

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

Filtration

Solvent extraction

Crystallization

Chromatography

56. The conversion of vapors directly into solid is called

None

Sublimation

Condensation

Freezing

57. One of the following does not sublime

Iodine

Naphthalene

Wax

NH₄Cl

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

Low temperature

High ignition temperature

High concentration

High solubility

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

Law of partial pressure

Distribution coefficients

Distribution law

Law of specific proportion

60. Sintered crucible is made up of

Filer

Plastic

Glass

Porcelain

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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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