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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. One of the following does not sublime

NH₄Cl

Wax

Naphthalene

Iodine

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

Ordinary filter paper

Under suction crucible

Fluted filter

Fine filter paper

3. CaC1₂ ad P₂O₅ are used as

Crystallizing agents

Drying agents

Deleting agents

Reside agents

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

Difficult

Time consuming

Fast

Accurate

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

Sublimation

Solvent extraction

Filtration

Boiling

6. Examples of sublimate does not include

Naphthalene

Ammonium salts

Iodine

Nitrates

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

Filtration

Condensation

Crystallization

Separation

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

High solubility

High ignition temperature

High concentration

Low temperature

9. Sintered glass crucible is used for

Convenient filtration than that by Gooch crucible

Purification of slid

To avoid premature crystallization of solute

Separation of two miscible liquids

10. 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 tip of funnel should not touch the beaker

The stem of the funnel should be small

11. 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

12. Sintered crucible is made up of

Plastic

Porcelain

Glass

Filer

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

Calculation

Measurement

Separation

Identification

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

It keeps the stem of funnel full of liquid

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

It is used to separate organic compounds from water

A solid compound is purified

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

Law of partial pressure

Law of specific proportion

Distribution coefficients

Distribution law

16. The most common example of solvent extraction is

Naphthalene

Chloroform

Ether

Acetone

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

90⁰

80⁰

180⁰

60⁰

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

Size of the chromatographic tank used

Rf values of solutes

The size of paper used

Temperature of the experiment

19. During the process of crystallization the hot saturated solution

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

Evaporated to get the crystals of the product

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

Boiling point of solvent

Distribution coefficient

Distribution law

Low partial pressures

21. The dried paper containing pattern on paper is called

Chrome

Chromatogram

Chromatograph

Chromophore

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

Distribution law

Amount of solute

Amount of solute used

Law of mass action

23. Paper chromatography is a type

Partition chromatography

Absorption chromatography

None

Adsorption chromatography

24. Which one is not the drying agent

CaOCl

Silica gel

Phosphorus penta-oxide

Cacl₂

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

Mud

Crystal

Steel

Residue

Page 2 of 3

26. Condensed solid produced during sublimation is

Insoluble

Sublimate

Residue

Crystal

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

Water bath

Wire gauze

Ice bath

Thermostat

28. 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

29. A process controlled by distribution law is

Sublimation

Filtration

Solvent extraction

Crystallization

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

Chromatography

Sublimation

Solvent extraction

Filtration

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

Solvent extraction

Filtration

Crystallization

Chromatography

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

Acetic acid

Chloroform

Carbon tetrachloride

Ethanol

33. Solvent extraction method is used for compounds which are

None

Volatile

Both A and B

Thermally unstable

34. 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 paper has got small sized pores in it

If the paper fits tightly

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

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

Filtering cold solution

Filling warm solution

Filtering hot saturated solution using hot funnel

Quick filtration

36. Safe and reliable method of drying crystal in through

Drying it in oven

Evaporation of solution

Pressing it between folds of filter paper

Vacuum desiccator

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

Non – volatile or thermally stable

Volatile or thermally stable

Volatile or thermally unstable

Non – volatile or thermally unstable

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

Formation of solution and filtration

Sublimation

Formation of solution and evaporation

Chromatography

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

For preparation of chemical compound

Quick filtration can be done

It dissolves a large amount of the substance

It should deposit well-formed crystals of the pure compound

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

Crystallization does not involve heating

Avoided

Depends on temperature

Needed

41. The conversion of vapors directly into solid is called

Sublimation

Freezing

Condensation

None

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

Adsorption chromatography

None

Absorption chromatography

Partition chromatography

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

Solvent front

Base line

Chromatogram

Event

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

Nature of reactants

Nature of filter paper

Nature of precipitate

Nature of reaction

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

NaC1

KC1

KBr

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

Sublimation

Decomposition

Evaporation

Crystallization

47. Chromatography is important in

Determination of purity

Quantitative analysis

All of these

Qualitative analysis

48. The crystals are drying through a

Vacuum desiccator

None

Direct providing heat

Vacuum pump

49. The technique of chromatography is used in

All

Purification

Separation

Isolation

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

Nonvolatile or thermally stable

Volatile or thermally stable

Non-volatile or thermally unstable

Page 3 of 3

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

Sublimation

Filtration

Crystallization

Chromatography

52. The process of filtration is used to

Separate the two immiscible liquids

Separate solute from solution

Separate insoluble particles from liquids

Separate the two miscible liquids

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

Impurities should crystallize along with the solute

Should be safe to use

It should react chemically with the solute

Should be expensive

54. After filtration slow cooling yields

Bigger & pure crystals

Smaller & pure

Smaller & impure

Bigger & impure crystals

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

Filter paper

Oven

Desicator

None

56. Which type of chromatography has fixed phase

Gas

Partition

None of these

Absorption

57. Iodine-salt mixture can be separated through

Fractional distillation

Simple filtration

Simple distillation

Sublimation

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

Their partition coefficients

Used

The size of paper used

Their Rf values

59. Gooch crucible is used to filter the solution of

Under suction crucible

KMnO4

KOH

K2Cr2O7

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

Decomposing

Melting

Condensing

Sublimation

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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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