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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 is directly related to Qualitative analysis?

Identification

Separation

Calculation

Measurement

2. 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

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

Avoided

Crystallization does not involve heating

Depends on temperature

Needed

4. CaC1₂ ad P₂O₅ are used as

Reside agents

Deleting agents

Drying agents

Crystallizing agents

5. After filtration slow cooling yields

Smaller & pure

Bigger & impure crystals

Smaller & impure

Bigger & pure crystals

6. Examples of sublimate does not include

Ammonium salts

Naphthalene

Nitrates

Iodine

7. Chromatography is important in

Determination of purity

Qualitative analysis

Quantitative analysis

All of these

8. Paper chromatography is a type

Absorption chromatography

Partition chromatography

Adsorption chromatography

None

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

Low partial pressures

Distribution coefficient

Distribution law

Boiling point of solvent

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

Distribution law

Law of mass action

Amount of solute

Amount of solute used

11. 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 be small

The stem of the funnel should remain continuously full of liquids

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

The size of paper used

Size of the chromatographic tank used

Rf values of solutes

Temperature of the experiment

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

Crystallization

Filtration

Solvent extraction

Chromatography

14. 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

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

Filtration

Solvent extraction

Boiling

Sublimation

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

Carbon tetrachloride

Acetic acid

Ethanol

Chloroform

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

Partition chromatography

Adsorption chromatography

None

Absorption chromatography

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

Condensation

Separation

Filtration

Crystallization

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

Sublimation

Crystallization

Decomposition

Evaporation

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

Solvent front

Chromatogram

Event

Base line

21. Gooch crucible is used to filter the solution of

Under suction crucible

K2Cr2O7

KMnO4

KOH

22. 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

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

The size of paper used

Their Rf values

Used

Their partition coefficients

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

Distribution law

Law of partial pressure

Law of specific proportion

Distribution coefficients

25. Sintered crucible is made up of

Plastic

Glass

Porcelain

Filer

Page 2 of 3

26. Condensed solid produced during sublimation is

Residue

Sublimate

Crystal

Insoluble

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

Law of mass action

The amount of solvent used

The amount of solute

Distribution law

28. One of the following does not sublime

Iodine

NH₄Cl

Wax

Naphthalene

29. 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

30. 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 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

31. Sintered glass crucible is used for

Purification of slid

Convenient filtration than that by Gooch crucible

To avoid premature crystallization of solute

Separation of two miscible liquids

32. The crystals are drying through a

Direct providing heat

Vacuum desiccator

Vacuum pump

None

33. 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

Non-volatile or thermally unstable

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

Water bath

Ice bath

Thermostat

Wire gauze

35. The dried paper containing pattern on paper is called

Chromatogram

Chrome

Chromophore

Chromatograph

36. 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

37. Solvent extraction method is used for compounds which are

Volatile

Both A and B

None

Thermally unstable

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

High solubility

High concentration

Low temperature

High ignition temperature

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

It should deposit well-formed crystals of the pure compound

Quick filtration can be done

For preparation of chemical compound

It dissolves a large amount of the substance

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

Nature of filter paper

Nature of reaction

Nature of precipitate

Nature of reactants

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

KC1

KBr

NaC1

42. The most common example of solvent extraction is

Naphthalene

Ether

Chloroform

Acetone

43. The technique of chromatography is used in

Isolation

Purification

Separation

All

44. Which type of chromatography has fixed phase

Gas

None of these

Absorption

Partition

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

180⁰

60⁰

90⁰

80⁰

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

Steel

Mud

Residue

Crystal

47. A process controlled by distribution law is

Crystallization

Solvent extraction

Sublimation

Filtration

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

Should be safe to use

Impurities should crystallize along with the solute

It should react chemically with the solute

Should be expensive

49. 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

50. The conversion of vapors directly into solid is called

Freezing

None

Condensation

Sublimation

Page 3 of 3

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

Difficult

Accurate

Fast

Time consuming

52. 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

Evaporated to get the crystals of the product

Cooled very slowly to get large sized crystals

53. Which one is not the drying agent

Silica gel

Cacl₂

CaOCl

Phosphorus penta-oxide

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

Crystallization

Filtration

Sublimation

Chromatography

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

Sublimation

Chromatography

Filtration

Solvent extraction

56. Safe and reliable method of drying crystal in through

Evaporation of solution

Drying it in oven

Vacuum desiccator

Pressing it between folds of filter paper

57. Iodine-salt mixture can be separated through

Simple distillation

Fractional distillation

Sublimation

Simple filtration

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

Desicator

None

Filter paper

Oven

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

Fluted filter

Under suction crucible

Fine filter paper

Ordinary filter paper

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

Sublimation

Melting

Decomposing

Condensing

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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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