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Section A: Concepts of Mixtures

1. A mixture is formed when __________.
A. Two or more substances are chemically joined
B. Two or more substances are combined without chemical change
C. One substance changes into another
D. Heat is applied to form a new substance

2. Which of the following is a mixture?
A. Water
B. Carbon dioxide
C. Air
D. Salt

3. Which of the following is NOT a mixture?
A. Seawater
B. Lemon juice
C. Iron
D. Salad

4. The main characteristic of a mixture is that __________.
A. It forms a new substance
B. Its components can be separated easily
C. It has a fixed composition
D. It cannot be separated

5. Which of the following is a homogeneous mixture?
A. Oil and water
B. Salt and water
C. Sand and iron filings
D. Flour and rice

6. Which of these is a heterogeneous mixture?
A. Vinegar
B. Air
C. Salad
D. Sugar solution

7. The air we breathe is a mixture of __________.
A. Hydrogen and oxygen
B. Oxygen and carbon dioxide only
C. Nitrogen, oxygen, and other gases
D. Carbon dioxide and nitrogen only

8. The components of a mixture retain their __________.
A. Chemical properties
B. Physical properties
C. Molecular structure
D. None of these

9. Mixtures can be separated by __________ means.
A. Chemical
B. Physical
C. Electrical
D. Biological

10. Which of the following is a solid-solid mixture?
A. Salt and water
B. Sand and iron filings
C. Sugar and milk
D. Oil and water

Section B: Separation of Mixtures

11. The method used to separate sand from water is __________.
A. Filtration
B. Evaporation
C. Condensation
D. Distillation

12. To separate salt from salt solution, we use __________.
A. Filtration
B. Evaporation
C. Sieving
D. Decantation

13. Which method is used to separate a mixture of iron filings and sand?
A. Filtration
B. Magnetic separation
C. Decantation
D. Evaporation

14. Which process involves changing a liquid into vapour?
A. Condensation
B. Evaporation
C. Freezing
D. Melting

15. A mixture of oil and water can be separated by __________.
A. Filtration
B. Decantation
C. Sieving
D. Evaporation

16. The method of separating a mixture by passing it through a filter paper is called __________.
A. Decantation
B. Filtration
C. Evaporation
D. Sedimentation

17. Which separation method is used for grains of different sizes?
A. Filtration
B. Sieving
C. Winnowing
D. Magnetic separation

18. Which of the following separation techniques involves wind or air?
A. Sieving
B. Winnowing
C. Filtration
D. Evaporation

19. When a mixture of sand and water is allowed to settle, the process is called __________.
A. Filtration
B. Sedimentation
C. Decantation
D. Evaporation

20. Which process involves heating a liquid to obtain vapour and then cooling it?
A. Evaporation
B. Distillation
C. Filtration
D. Sedimentation

Section C: Solutions

21. A solution is a __________ mixture.
A. Homogeneous
B. Heterogeneous
C. Chemical
D. Complex

22. The substance that dissolves in another to form a solution is called the __________.
A. Solvent
B. Solute
C. Mixture
D. Residue

23. The substance that dissolves the solute is called the __________.
A. Solvent
B. Solution
C. Mixture
D. Residue

24. In salt solution, salt is the __________.
A. Solvent
B. Solute
C. Solution
D. Mixture

25. In salt solution, water is the __________.
A. Solute
B. Solvent
C. Mixture
D. Solid

26. A solution that contains a large amount of solute is called a __________ solution.
A. Dilute
B. Concentrated
C. Saturated
D. Weak

27. A solution that cannot dissolve any more solute is called __________.
A. Concentrated
B. Dilute
C. Saturated
D. Homogeneous

28. When no solute is visible in a solution, it means the solute has __________.
A. Evaporated
B. Dissolved completely
C. Settled down
D. Reacted

29. The process by which a solute dissolves in a solvent is called __________.
A. Sedimentation
B. Solution formation
C. Dissolving
D. Mixing

30. Which of the following will dissolve most substances?
A. Alcohol
B. Oil
C. Water
D. Mercury

Section D: Factors Affecting Solubility

31. Which factor increases the rate at which a solute dissolves in a solvent?
A. Decreasing temperature
B. Stirring
C. Adding more solute
D. Stopping movement

32. Increasing the temperature generally makes solids dissolve __________.
A. Faster
B. Slower
C. Not at all
D. Equally

33. The solubility of gases in liquids __________ when temperature increases.
A. Increases
B. Decreases
C. Remains constant
D. Becomes zero

34. Stirring helps a solute dissolve faster by __________.
A. Decreasing solubility
B. Increasing contact between solute and solvent
C. Cooling the solution
D. Making solute settle

35. Crushing a solute into smaller pieces helps it dissolve faster because it __________.
A. Reduces surface area
B. Increases surface area
C. Changes it chemically
D. Reduces solubility

36. When you stir salt in water, it dissolves faster because of __________.
A. Cooling
B. Movement of water particles
C. Chemical reaction
D. Evaporation

37. Which factor does NOT affect solubility?
A. Temperature
B. Stirring
C. Colour
D. Particle size

38. A saturated solution can become unsaturated when __________.
A. The temperature is increased
B. More solute is added
C. The solvent is removed
D. The mixture is cooled

39. Solubility is defined as the __________.
A. Amount of solvent in a solution
B. Amount of solute that can dissolve in a solvent
C. Volume of the solvent
D. Weight of the solution

40. The temperature at which a solution becomes saturated is called the __________.
A. Solvent point
B. Boiling point
C. Saturation point
D. Freezing point

Section E: Applications and Examples

41. Which of these is an example of a gaseous solution?
A. Lemon juice
B. Air
C. Milk
D. Seawater

42. Which of these is an example of a liquid-liquid solution?
A. Vinegar
B. Air
C. Brass
D. Ink and water

43. Brass is a mixture of __________.
A. Copper and tin
B. Copper and zinc
C. Iron and carbon
D. Lead and silver

44. Which of the following mixtures is useful in everyday life?
A. Muddy water
B. Seawater
C. Air
D. All of the above

45. Salt and sugar can be separated by __________.
A. Filtration
B. Evaporation and crystallization
C. Magnetism
D. Sieving

46. Ink is a mixture of __________.
A. Water and carbon dioxide
B. Dyes and water
C. Alcohol and air
D. Oil and pigments

47. Which of the following mixtures can be separated by filtration?
A. Salt solution
B. Sand and water
C. Air and dust
D. Alcohol and water

48. The clear liquid that passes through the filter paper is called the __________.
A. Residue
B. Filtrate
C. Solute
D. Solvent

49. The solid material left on the filter paper is called the __________.
A. Solute
B. Filtrate
C. Residue
D. Solution

50. Which of these processes is involved in the water cycle and in separating mixtures?
A. Melting
B. Distillation
C. Condensation
D. Both B and C

# data[].attributes.body
Section A

1.B.Two or more substances are combined without chemical change.

2.A.water D.salt

3.C.Iron.

4.A.It forms a new substance.

5.B.Salt and water.

6.C.Salad.

7.A.Hydrogen and oxygen.

8.B.Physical properties.

9.A.Chemical.

10.B.Sand and iron flillings

Section B

11.A.Filtration.

12.B.Evaporation

13.B.Magnetic separation

14.B.Evaporation.

15.B.Decantation.

16.B.Filtration.

17.C.Winnowing.

18.A.Sieving.

19.C.Decantation.

20. D.Sedimentation.

Section C

21.A.Homogeneous.

22.B.Solvent.

23.B.Solution.

24.A.Solvent

25.A.Solute

26.A.Dilute

27.C.Saturated.

28.B.Dissolved completely.

29.D.Solution formation.

30.C.Water.

Section D

31.A.Decreasing temperature.

32.D.Equally.

33.A.Increases.

34.D.Making solute settle.

35.C.Change it chemical.

36.B.Movement of particles.

37.D.Particle size.

38.C.The solvent is removed.

39.B.Amount of solute that can dissolve in a solvent.

40.A.Solvent point.

Section E

41.B.Air

42.Ink and water.

43.C.Iron and carbon.

44.C.Air

45.D.Sieving.

46.B.Dyes and water.

47.B.Sand and water.

48.B.Filtrate.

49.C.Residue.

50.D.Both B and C.