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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

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Page 1 of 3

Chemistry

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

Separation

Identification

Calculation

Measurement

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

KBr

NaC1

KC1

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

Boiling

Sublimation

Filtration

Solvent extraction

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

Ethanol

Chloroform

Acetic acid

Carbon tetrachloride

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

Evaporation

Decomposition

Sublimation

Crystallization

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

Crystallization does not involve heating

Depends on temperature

Avoided

Needed

7. The crystals are drying through a

Vacuum desiccator

None

Direct providing heat

Vacuum pump

8. 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

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

Low temperature

High ignition temperature

High solubility

High concentration

10. Examples of sublimate does not include

Naphthalene

Ammonium salts

Iodine

Nitrates

11. The conversion of vapors directly into solid is called

Freezing

None

Condensation

Sublimation

12. Solvent extraction method is used for compounds which are

Thermally unstable

Volatile

Both A and B

None

13. Which one is not the drying agent

Phosphorus penta-oxide

Cacl₂

Silica gel

CaOCl

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

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 fits tightly

If the paper has got small sized pores in it

15. Safe and reliable method of drying crystal in through

Drying it in oven

Pressing it between folds of filter paper

Evaporation of solution

Vacuum desiccator

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

Nature of reaction

Nature of filter paper

Nature of precipitate

Nature of reactants

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

Desicator

Oven

Filter paper

None

18. The technique of chromatography is used in

Purification

Separation

All

Isolation

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

Their partition coefficients

Used

Their Rf values

The size of paper used

20. 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

Non – volatile or thermally unstable

Volatile or thermally unstable

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

Sand and Nacl

Nacl and Kcl

Sand and naphthalene

Sand and broken pieces of glass

22. Gooch crucible is used to filter the solution of

KMnO4

KOH

K2Cr2O7

Under suction crucible

23. Condensed solid produced during sublimation is

Insoluble

Residue

Crystal

Sublimate

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

Sublimation

Crystallization

Filtration

Chromatography

25. CaC1₂ ad P₂O₅ are used as

Reside agents

Drying agents

Deleting agents

Crystallizing agents

Page 2 of 3

26. Paper chromatography is a type

None

Absorption chromatography

Adsorption chromatography

Partition chromatography

27. 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

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

Size of the chromatographic tank used

The size of paper used

Rf values of solutes

Temperature of the experiment

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

Filtration

Separation

Condensation

Crystallization

30. Sintered crucible is made up of

Porcelain

Filer

Glass

Plastic

31. The most common example of solvent extraction is

Naphthalene

Acetone

Chloroform

Ether

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

Law of specific proportion

Law of partial pressure

Distribution coefficients

Distribution law

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

80⁰

90⁰

180⁰

60⁰

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

Residue

Mud

Steel

Crystal

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

Law of mass action

The amount of solute

The amount of solvent used

Distribution law

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

Solvent extraction

Filtration

Crystallization

Chromatography

37. The dried paper containing pattern on paper is called

Chromatograph

Chromatogram

Chrome

Chromophore

38. After filtration slow cooling yields

Smaller & pure

Bigger & impure crystals

Smaller & impure

Bigger & pure crystals

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

Sublimation

Formation of solution and filtration

Formation of solution and evaporation

Chromatography

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

Boiling point of solvent

Distribution coefficient

Distribution law

Low partial pressures

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

Should be safe to use

Should be expensive

It should react chemically with the solute

Impurities should crystallize along with the solute

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

Partition chromatography

Adsorption chromatography

None

Absorption chromatography

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

Filtration

Sublimation

Solvent extraction

Chromatography

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

Ice bath

Water bath

Thermostat

Wire gauze

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

Fluted filter

Ordinary filter paper

Fine filter paper

Under suction crucible

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

It dissolves a large amount of the substance

For preparation of chemical compound

Quick filtration can be done

It should deposit well-formed crystals of the pure compound

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

Filtering hot saturated solution using hot funnel

Filling warm solution

Quick filtration

Filtering cold solution

48. Sintered glass crucible is used for

To avoid premature crystallization of solute

Purification of slid

Separation of two miscible liquids

Convenient filtration than that by Gooch crucible

49. Which type of chromatography has fixed phase

Gas

Absorption

None of these

Partition

50. The process of filtration is used to

Separate solute from solution

Separate the two immiscible liquids

Separate the two miscible liquids

Separate insoluble particles from liquids

Page 3 of 3

51. Chromatography is important in

All of these

Determination of purity

Quantitative analysis

Qualitative analysis

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

Condensing

Melting

Sublimation

Decomposing

53. Iodine-salt mixture can be separated through

Sublimation

Simple distillation

Fractional distillation

Simple filtration

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

Non-volatile or thermally unstable

Volatile or thermally stable

Nonvolatile or thermally stable

Non-volatile or thermally unstable

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

The tip of funnel should not touch the beaker

The filter paper should be small

The stem of the funnel should be small

The stem of the funnel should remain continuously full of liquids

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

Chromatogram

Solvent front

Event

Base line

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

Law of mass action

Amount of solute

Amount of solute used

Distribution law

58. One of the following does not sublime

Wax

Iodine

Naphthalene

NH₄Cl

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

Fast

Accurate

Time consuming

Difficult

60. A process controlled by distribution law is

Filtration

Crystallization

Sublimation

Solvent extraction

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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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Chemistry Experimental Techniques MCQS Online Test

ECAT Chemistry Experimental Techniques Chapter Online Test

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