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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. Condensed solid produced during sublimation is

Crystal

Residue

Sublimate

Insoluble

2. Which one is not the drying agent

Cacl₂

CaOCl

Phosphorus penta-oxide

Silica gel

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

The stem of the funnel should be small

The stem of the funnel should remain continuously full of liquids

The tip of funnel should not touch the beaker

The filter paper should be small

4. CaC1₂ ad P₂O₅ are used as

Drying agents

Reside agents

Deleting agents

Crystallizing agents

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

Condensation

Crystallization

Filtration

Separation

6. The most common example of solvent extraction is

Naphthalene

Ether

Chloroform

Acetone

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

Oven

Filter paper

Desicator

None

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

Formation of solution and evaporation

Formation of solution and filtration

Chromatography

Sublimation

9. 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

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

Distribution coefficients

Distribution law

Law of specific proportion

Law of partial pressure

11. The dried paper containing pattern on paper is called

Chromatogram

Chromatograph

Chrome

Chromophore

12. Which type of chromatography has fixed phase

None of these

Gas

Absorption

Partition

13. Iodine-salt mixture can be separated through

Simple distillation

Fractional distillation

Sublimation

Simple filtration

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

Nature of filter paper

Nature of reactants

Nature of precipitate

Nature of reaction

15. Sintered glass crucible is used for

Purification of slid

Convenient filtration than that by Gooch crucible

Separation of two miscible liquids

To avoid premature crystallization of solute

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

Size of the chromatographic tank used

Temperature of the experiment

The size of paper used

Rf values of solutes

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

Crystallization

Solvent extraction

Filtration

Chromatography

18. The crystals are drying through a

Vacuum pump

Vacuum desiccator

None

Direct providing heat

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

High concentration

Low temperature

High solubility

High ignition temperature

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

Crystallization

Evaporation

Decomposition

Sublimation

21. 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

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

Partition chromatography

Adsorption chromatography

Absorption chromatography

None

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

Non – volatile or thermally stable

Non – volatile or thermally unstable

Volatile or thermally unstable

Volatile or thermally stable

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

The amount of solute

Distribution law

The amount of solvent used

Law of mass action

25. A process controlled by distribution law is

Filtration

Sublimation

Solvent extraction

Crystallization

Page 2 of 3

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

Ordinary filter paper

Fluted filter

Under suction crucible

Fine filter paper

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

Measurement

Separation

Identification

Calculation

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

60⁰

80⁰

90⁰

180⁰

29. Sintered crucible is made up of

Plastic

Porcelain

Glass

Filer

30. One of the following does not sublime

Iodine

Wax

Naphthalene

NH₄Cl

31. Paper chromatography is a type

Absorption chromatography

Partition chromatography

Adsorption chromatography

None

32. Chromatography is important in

Quantitative analysis

Determination of purity

Qualitative analysis

All of these

33. The technique of chromatography is used in

All

Isolation

Separation

Purification

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

Filling warm solution

Filtering cold solution

Filtering hot saturated solution using hot funnel

Quick filtration

35. The conversion of vapors directly into solid is called

Freezing

Sublimation

None

Condensation

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

Ice bath

Thermostat

Water bath

Wire gauze

37. 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

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

Residue

Steel

Crystal

Mud

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

Filtration

Sublimation

Crystallization

Chromatography

40. Examples of sublimate does not include

Ammonium salts

Iodine

Nitrates

Naphthalene

41. 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

42. Gooch crucible is used to filter the solution of

Under suction crucible

KOH

KMnO4

K2Cr2O7

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

Melting

Sublimation

Condensing

Decomposing

44. Safe and reliable method of drying crystal in through

Pressing it between folds of filter paper

Drying it in oven

Evaporation of solution

Vacuum desiccator

45. Solvent extraction method is used for compounds which are

Volatile

Thermally unstable

Both A and B

None

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

Crystallization does not involve heating

Depends on temperature

Avoided

Needed

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

Carbon tetrachloride

Ethanol

Chloroform

Acetic acid

48. After filtration slow cooling yields

Smaller & impure

Bigger & impure crystals

Smaller & pure

Bigger & pure crystals

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

Fast

Time consuming

Difficult

Accurate

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

Law of mass action

Amount of solute used

Distribution law

Amount of solute

Page 3 of 3

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

Base line

Event

Chromatogram

Solvent front

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

Boiling point of solvent

Low partial pressures

Distribution law

Distribution coefficient

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

Filtration

Sublimation

Chromatography

Solvent extraction

54. 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

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

NaC1

KC1

KBr

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

Sublimation

Boiling

Filtration

Solvent extraction

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

Sand and Nacl

Sand and naphthalene

Nacl and Kcl

Sand and broken pieces of glass

58. 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

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

Should be expensive

Should be safe to use

It should react chemically with the solute

Impurities should crystallize along with the solute

60. 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

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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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