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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 one is the property of an ideal solvent?

Should be safe to use

Impurities should crystallize along with the solute

Should be expensive

It should react chemically with the solute

2. One of the following does not sublime

Iodine

Wax

NH₄Cl

Naphthalene

3. Condensed solid produced during sublimation is

Residue

Insoluble

Sublimate

Crystal

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

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

It keeps the stem of funnel full of liquid

A solid compound is purified

It is used to separate organic compounds from water

5. Safe and reliable method of drying crystal in through

Vacuum desiccator

Evaporation of solution

Pressing it between folds of filter paper

Drying it in oven

6. 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

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

Calculation

Identification

Measurement

Separation

8. CaC1₂ ad P₂O₅ are used as

Reside agents

Crystallizing agents

Deleting agents

Drying agents

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

Filtering cold solution

Filling warm solution

Quick filtration

Filtering hot saturated solution using hot funnel

10. The process of filtration is used to

Separate the two immiscible liquids

Separate insoluble particles from liquids

Separate solute from solution

Separate the two miscible liquids

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

Law of specific proportion

Distribution coefficients

Distribution law

Law of partial pressure

12. Sintered crucible is made up of

Glass

Filer

Plastic

Porcelain

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

Crystal

Residue

Mud

Steel

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

Volatile or thermally unstable

Volatile or thermally stable

Non – volatile or thermally stable

Non – volatile or thermally unstable

15. 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

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

Filter paper

Desicator

Oven

None

17. The technique of chromatography is used in

Isolation

Separation

Purification

All

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

Fine filter paper

Ordinary filter paper

Under suction crucible

Fluted filter

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

Sublimation

Condensing

Melting

Decomposing

20. Chromatography is important in

Determination of purity

All of these

Quantitative analysis

Qualitative analysis

21. Gooch crucible is used to filter the solution of

K2Cr2O7

KOH

Under suction crucible

KMnO4

22. After filtration slow cooling yields

Smaller & impure

Bigger & impure crystals

Bigger & pure crystals

Smaller & pure

23. Paper chromatography is a type

None

Partition chromatography

Absorption chromatography

Adsorption chromatography

24. The most common example of solvent extraction is

Chloroform

Naphthalene

Acetone

Ether

25. A process controlled by distribution law is

Sublimation

Filtration

Crystallization

Solvent extraction

Page 2 of 3

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

Filtration

Sublimation

Chromatography

Solvent extraction

27. Which one is not the drying agent

Phosphorus penta-oxide

Cacl₂

Silica gel

CaOCl

28. Solvent extraction method is used for compounds which are

Thermally unstable

Both A and B

None

Volatile

29. 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

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

Filtration

Crystallization

Condensation

Separation

31. 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

32. During the process of crystallization the hot saturated solution

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

Cooled at a moderate rate to get medium sized crystals

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

Adsorption chromatography

None

Partition chromatography

Absorption chromatography

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

Base line

Chromatogram

Event

Solvent front

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

Law of mass action

Distribution law

Amount of solute used

Amount of solute

36. Which type of chromatography has fixed phase

Partition

Gas

None of these

Absorption

37. 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

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

Carbon tetrachloride

Ethanol

Chloroform

Acetic acid

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

Depends on temperature

Crystallization does not involve heating

Avoided

Needed

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

If the paper covers the funnel up to its circumference

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

If the paper has got small sized pores in it

If the paper fits tightly

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

Fast

Accurate

Time consuming

Difficult

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

60⁰

180⁰

90⁰

80⁰

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

Nature of reactants

Nature of reaction

Nature of filter paper

Nature of precipitate

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

Sand and broken pieces of glass

Sand and Nacl

Nacl and Kcl

Sand and naphthalene

45. 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

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

Sublimation

Filtration

Crystallization

Chromatography

47. Iodine-salt mixture can be separated through

Simple distillation

Fractional distillation

Sublimation

Simple filtration

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

NaC1

KBr

KC1

49. 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

50. Examples of sublimate does not include

Naphthalene

Iodine

Nitrates

Ammonium salts

Page 3 of 3

51. 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 tip of funnel should not touch the beaker

The stem of the funnel should remain continuously full of liquids

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

Solvent extraction

Filtration

Sublimation

Boiling

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

Crystallization

Filtration

Chromatography

Solvent extraction

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

Volatile or thermally stable

Non-volatile or thermally unstable

Nonvolatile or thermally stable

55. The conversion of vapors directly into solid is called

Sublimation

Condensation

None

Freezing

56. The crystals are drying through a

Vacuum pump

Vacuum desiccator

Direct providing heat

None

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

Ice bath

Wire gauze

Thermostat

Water bath

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

High ignition temperature

High solubility

Low temperature

High concentration

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

Distribution coefficient

Distribution law

Boiling point of solvent

Low partial pressures

60. The dried paper containing pattern on paper is called

Chromophore

Chrome

Chromatogram

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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Maan Ali

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Chemistry Experimental Techniques MCQS Online Test

ECAT Chemistry Experimental Techniques Chapter Online Test

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