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SCIENCE PRACTICE QUESTIONS

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MIXTURES

1.

An example of a mixture is

A.

sodium sulphate.

B.

hydrogen chloride.

C.

ammonia.

D.

salt solution

2.

The use of separating funnel is most appropriate for separating which of the following mixtures?

A.

Sulphur and water

B.

Water and sodium chloride

C.

Vegetable oil and kerosene

D.

Water and vegetable oil

3.

The solid component found on the filter paper and the liquid component that flows into a container during filtration are respectively called

A.

filtrate and residue.

B.

condensate and residue.

C.

residue and filtrate.

D.

residue and condensate

4.

A mixture of alcohol and water can best be separated by

A.

filtration.

B.

condensation.

C.

distillation.

D.

evaporation.

5.

Which of the following substances is a solid-gas mixture?

A.

Lather

B.

Bronze

C.

Steel

D.

Smoke

6.

Which of the following processes is used to separate insoluble solids from liquids?

A.

Crystallization

B.

Evaporation

C.

Filtration

D.

Sublimation

7.

The portion of air which acts as a solvent is

A.

oxygen.

B.

carbon (IV) oxide.

C.

nitrogen.

D.

an inert gas.

8.

The solid component found on the filter paper and the liquid component that flows into a container during filtration are respectively called

A.

filtrate and residue.

B.

condensate and residue.

C.

residue and filtrate.

D.

residue and condensate

9.

A mixture of alcohol and water can best be separated by

A.

filtration.

B.

condensation.

C.

distillation.

D.

evaporation.

10.

Which of the following processes could be used to obtain water from a salt solution?

A.

Filtration

B.

Decantation

C.

Evaporation

D.

Distillation

E.
Sedimentation

11.

Brine is a saturated solution of

A.

sodium chloride and carbon dioxide

B.

calcium carbonate and water

C.

sodium chloride and water

D.

calcium carbonate and kerosene

E.
magnesium and water

12.

Which of the following substances can dissolve almost all solutes?

A.

Kerosene

B.

Palm oil

C.

Water

D.

Turpentine

E.
Petrol

13.

Which of the following processes is used to separate insoluble solids from liquids?

A.

Distillation

B.

Sublimation

C.

Filtration

D.

Evaporation

E.
Sedimentation

14.

The part of the plant which is found in the soil is the

A.

flower

B.

stem

C.

leaf

D.

root

E.
fruit

15.

Which of the following activities illustrates distillation?

A.

Preparation of soup

B.

Preparation of akpeteshie

C.

Tapping of palm wine

D.

Preparation of starch

E.
Freezing of water

16.

Which of the following methods will be most suitable for separating a mixture of iron filings and sulphur powder?

A.

Winnowing

B.

Decanting

C.

Magnetization

D.

Evaporation

E.
Distillation

17.

Which of the following substances is a mixture?

A.

Sodium chloride

B.

Sulphur dioxide

C.

Sugar solution

D.

Carbon dioxide

E.
Ammonium chloride

18.

The process by which a hot saturated solution is cooled to obtain some of the solute is called

A.

condensation

B.

evaporation

C.

crystallization

D.

distillation

E.
sedimentation

19.

Which of the following mixtures can be separated by filtration?

A.

Salt in water

B.

Sugar in water

C.

Sand in water

D.

Oil in water

E.
Omo in water

20.

Kerosene and petrol are obtained from crude oil by

A.

distillation

B.

condensation

C.

filtration

D.

evaporation

E.
decantation

21.

A mixture of raw starch and water is best separated by

A.

boiling

B.

distillation

C.

decantation

D.

winnowing

E.

crystallization

22.

Smoke is an example of a mixture of

A.

Gases

B.

Liquids in gases

C.

Solids in liquids

D.

solids in gases

E.
solids in solids

23.

Which of the following processes can be used to obtain local gin from palm wine?

A.

Evaporation

B.

Condensation

C.

Distillation

D.

Filtration

E.
Sublimation

24.

A mixture of sugar and water can be separated by

A.

Filtration

B.

Evaporation

C.

Decantation

D.

Distillation

E.
Condensation

25.

All the following substances are mixtures except

A.

ink

B.

blood

C.

air

D.

palm wine

E.

carbon dioxide

26.

The process used in getting salt from sea water is

A.

boiling

B.

condensation

C.

decantation

D.

sedimentation

E.
evaporation

27.

Gin can be obtained from palm wine by

A.

condensation

B.

freezing

C.

sedimentation

D.

distillation

E.
filtration

28.

A mixture of sand and water can be separated through

A.

filtration

B.

ionization

C.

condensation

D.

sedimentation

E.
evaporation

29.

A mixture of engine oil and water could be best separated by

A.

Evaporation

B.

Freezing

C.

Decantation

D.

Heating

E.

Addition of soap

30.

Which of the following processes should be carried out first when separating a mixture of sand and common salt?

A.

crystallization of the salt

B.

dissolution of the salt

C.

distillation of the solvent

D.

filtration of the mixture

E.

sublimation of the solute

31.

Kerosene and petrol are obtained from crude oil by
A.
condensation of the crude oil
B.
decantation of the crude oil
C.
distillation of the crude oil
D.
evaporation of the crude oil
E.
filtration of the crude oil

32.

A mixture of sand and common salt could be separated by

A.

filtration and distillation

B.

dissolution and evaporation

C.

dissolution, sedimentation and evaporation

D.

dissolution, filtration and evaporation

E.

sedimentation and filtration

33.

Salt could be obtained from sea water by

A.

boiling

B.

condensation

C.

decantation

D.

distillation

E.

evaporation

34.

Which of the following conditions will cause the same quantity of sugar to dissolve faster in a given volume of water?

A.

Stirring the solution

B.

Grinding the sugar

C.

Heating the solution

D.

Dissolving in a bigger container

E.

Cooling the solution

35.

Addition of more solvent to a solution makes the solution more

A.

dense.

B.

dilute.

C.

concentrated.

D.

saturated.

E.

super saturated.

36.

Crystals of sugar were obtained when a hot solution of sugar was cooled to room temperature. What conclusion can be drawn from this observation?

A.

Sugar does not dissolve in cold water

B.

Sugar does not dissolve in hot water

C.

Sugar dissolves more in hot water than in cold water

D.

Sugar dissolves less in hot water than in cold water

E.

Sugar dissolves more in cold water than in hot water

37.

A solution in which no more solute will dissolve at a particular temperature is said to be

A.

concentrated.

B.

dilute.

C.

saturated.

D.

insoluble.

E.

unsaturated.

38.

The method used to separate an insoluble solid from a liquid is

A.

crystallization.

B.

distillation.

C.

filtration.

D.

sublimation.

39.

A solution in which no more solute will dissolve at a given temperature is said to be

A.

concentrated.

B.

dilute.

C.

homogeneous.

D.

saturated.

40.

A clear solution of sugar was cooled from 100oC to 25oC. Some solid sugar was seen to have formed out of the solution after the cooling. This shows that sugar

A.

does not dissolve in cold water.

B.

does not dissolve in hot water.

C.

dissolves more in hot water than in cold water.

D.

dissolves more in cold water than in hot water.

41.

Water is sometimes referred to as a universal solvent because it

A.

is the purest liquid on earth.

B.

is the commonest liquid on earth.

C.

is found in all living cells.

D.

dissolves most substances.

42.

Steel is an example of a

A.

solid in solid mixture.

B.

solid in liquid mixture.

C.

gas in solid mixture.

D.

liquid in liquid mixture.

43.

Common salt (sodium chloride) is obtained from sea water by

A.

condensation.

B.

evaporation.

C.

precipitation.

D.

sublimation.

44.

Which of the following solvents can be used to remove grease from the hand?

A.

Alcohol.

B.

Palm kernel oil.

C.

Turpentine.

D.

Water.

45.

The process whereby a hot saturated solution is cooled to obtain the solute is called

A.

condensation.

B.

crystallization.

C.

distillation.

D.

evaporation.

46.

If a mixture of water and powdered charcoal is allowed to stand for a long time, the charcoal

A.

raises to the top.

B.

settles at the bottom.

C.

dissolves completely in the water.

D.

continues to remain suspended in the water.

47.

Which of these methods is used to separate insoluble solids from liquids?

A.

Distillation

B.

Evaporation

C.

Filtration

D.

Winnowing

48.

Which of the following liquids cannot dissolve an oil paint?

A.

Kerosene

B.

Petrol

C.

Turpentine

D.

Water

49.

The following substances are mixtures except

A.

air.

B.

carbon dioxide.

C.

salt solution.

D.

smoke.

50.

When a solid-liquid mixture is filtered, the liquid that separates out into the container is called

A.

filtrate.

B.

residue.

C.

sediment.

D.

solution.

51.

Air is an example of

A.

gas in gas mixture.

B.

liquid in liquid mixture.

C.

solid in liquid mixture.

D.

solid in solid mixture.

52.

Which of the following substances is a solid-gas mixture?

A.

Lather

B.

Bronze

C.

Steel

D.

Smoke

53.

Which of the following processes is used to separate insoluble solids from liquids?

A.

Crystallization

B.

Evaporation

C.

Filtration

D.

Sublimation

54.

The solvent which is most effective in washing bitumen from the hand is

A.

acid.

B.

alcohol.

C.

kerosene.

D.

water.

55.

A mixture of sugar and water could be separated by

A.

decantation.

B.

evaporation.

C.

filtration.

D.

sublimation.

56.

Which of the following apparatus is not required in the process of distillation in the laboratory?

A.

Condenser

B.

Evaporating dish

C.

Bunsen burner

D.

Round bottom flask

57.

Which of the following substances is a mixture?

A.

Water

B.

Sodium chloride

C.

Sodium chloride solution

D.

Iron filing

58.

An example of mixtures that can be separated by the method of filtration is

A.

sugar in water.

B.

sand in water.

C.

oil in water.

D.

ink in water.

59.

Which of the following processes is used separate insoluble solids from liquids?

A.

Sublimation

B.

Filtration

C.

Evaporation

D.

Crystallization

60.

The process used to separate a mixture of iron filings and sulphur is

A.

magnetic attraction

B.

sublimation

C.

distillation

D.

evaporation

61.

A liquid-liquid mixture can be seperated by

A.

filtration

B.

evaporation

C.

sublimation

D.

distillation

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