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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.
Test Helpful For:	ECAT Entry Test Chemistry Online Test Interview Questions about Chemisttry All Universities Entrance Test Recruitments Tests

ECAT Chemistry Experimental Techniques Test

Page 1 of 3

Chemistry

1. Iodine-salt mixture can be separated through

Sublimation

Simple filtration

Fractional distillation

Simple distillation

2. 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

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

Accurate

Time consuming

Difficult

Fast

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

Chromatography

Crystallization

Solvent extraction

Filtration

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

Steel

Residue

Mud

Crystal

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

The amount of solvent used

Law of mass action

The amount of solute

Distribution law

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

Sublimation

Decomposing

Condensing

Melting

8. One of the following does not sublime

NH₄Cl

Naphthalene

Wax

Iodine

9. Safe and reliable method of drying crystal in through

Evaporation of solution

Pressing it between folds of filter paper

Drying it in oven

Vacuum desiccator

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

Wire gauze

Ice bath

Thermostat

Water bath

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

Sublimation

Solvent extraction

Filtration

Boiling

12. 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 remain continuously full of liquids

The stem of the funnel should be small

13. Paper chromatography is a type

Absorption chromatography

Partition chromatography

Adsorption chromatography

None

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

Rf values of solutes

Size of the chromatographic tank used

The size of paper used

Temperature of the experiment

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

Condensation

Crystallization

Filtration

Separation

16. The conversion of vapors directly into solid is called

Sublimation

None

Freezing

Condensation

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

Low temperature

High concentration

High ignition temperature

High solubility

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

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

A solid compound is purified

It keeps the stem of funnel full of liquid

It is used to separate organic compounds from water

19. Which one is not the drying agent

CaOCl

Silica gel

Phosphorus penta-oxide

Cacl₂

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

Amount of solute

Amount of solute used

Distribution law

Law of mass action

21. Sintered crucible is made up of

Filer

Plastic

Porcelain

Glass

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

180⁰

80⁰

90⁰

60⁰

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

Filter paper

Oven

Desicator

None

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

Acetic acid

Ethanol

Chloroform

Carbon tetrachloride

25. Sintered glass crucible is used for

Purification of slid

To avoid premature crystallization of solute

Separation of two miscible liquids

Convenient filtration than that by Gooch crucible

Page 2 of 3

26. Solvent extraction method is used for compounds which are

Thermally unstable

None

Volatile

Both A and B

27. 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

28. The dried paper containing pattern on paper is called

Chrome

Chromatogram

Chromatograph

Chromophore

29. The technique of chromatography is used in

Isolation

Purification

All

Separation

30. The most common example of solvent extraction is

Chloroform

Ether

Acetone

Naphthalene

31. 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

32. During the process of crystallization the hot saturated solution

Evaporated to get the crystals of the product

Cooled at a moderate rate to get medium sized crystals

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

Cooled very slowly to get large sized crystals

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

Sublimation

Crystallization

Filtration

Chromatography

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

Filtration

Chromatography

Solvent extraction

Sublimation

35. Condensed solid produced during sublimation is

Crystal

Insoluble

Sublimate

Residue

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

Quick filtration can be done

For preparation of chemical compound

It dissolves a large amount of the substance

It should deposit well-formed crystals of the pure compound

37. 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

38. CaC1₂ ad P₂O₅ are used as

Crystallizing agents

Reside agents

Deleting agents

Drying agents

39. After filtration slow cooling yields

Bigger & impure crystals

Bigger & pure crystals

Smaller & impure

Smaller & pure

40. Examples of sublimate does not include

Ammonium salts

Iodine

Nitrates

Naphthalene

41. A process controlled by distribution law is

Sublimation

Solvent extraction

Crystallization

Filtration

42. 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

43. The crystals are drying through a

Vacuum desiccator

Direct providing heat

Vacuum pump

None

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

Under suction crucible

Fine filter paper

Fluted filter

Ordinary filter paper

45. 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

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

Distribution law

Distribution coefficient

Boiling point of solvent

Low partial pressures

47. 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

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

Formation of solution and filtration

Formation of solution and evaporation

Sublimation

Chromatography

49. Which type of chromatography has fixed phase

Partition

Absorption

None of these

Gas

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

Distribution coefficients

Distribution law

Law of specific proportion

Law of partial pressure

Page 3 of 3

51. The process of filtration is used to

Separate the two immiscible liquids

Separate insoluble particles from liquids

Separate the two miscible liquids

Separate solute from solution

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

KBr

NaC1

KC1

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

Base line

Solvent front

Chromatogram

Event

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

Adsorption chromatography

Partition chromatography

None

Absorption chromatography

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

Nature of precipitate

Nature of reaction

Nature of reactants

Nature of filter paper

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

Needed

Depends on temperature

Avoided

Crystallization does not involve heating

57. Chromatography is important in

All of these

Quantitative analysis

Qualitative analysis

Determination of purity

58. Gooch crucible is used to filter the solution of

KMnO4

K2Cr2O7

Under suction crucible

KOH

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

Sand and Nacl

Nacl and Kcl

Sand and broken pieces of glass

Sand and naphthalene

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

Separation

Calculation

Identification

Measurement

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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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