1. A mixture is a combination of substances that are:
A) Chemically combined
B) Physically combined
C) Permanently bonded
D) Ionically bonded
Answer: B
2. Which of the following is a homogeneous mixture?
A) Sand and iron filings
B) Oil and water
C) Salt dissolved in water
D) Soil
Answer: C
3. Which of the following is a heterogeneous mixture?
A) Air
B) Sugar solution
C) Brass
D) Sand and water
Answer: D
4. The components of a mixture can be separated by:
A) Chemical reaction
B) Physical methods
C) Nuclear reaction
D) Burning
Answer: B
5. Air is mainly a mixture of:
A) Oxygen and hydrogen
B) Nitrogen and oxygen
C) Carbon and oxygen
D) Hydrogen and nitrogen
Answer: B
6. Which method is used to separate insoluble solid from liquid?
A) Distillation
B) Evaporation
C) Filtration
D) Chromatography
Answer: C
7. The process of separating liquids based on boiling points is called:
A) Filtration
B) Sublimation
C) Distillation
D) Sedimentation
Answer: C
8. Which of the following is an example of an alloy?
A) Salt water
B) Milk
C) Brass
D) Carbon dioxide
Answer: C
9. Brass is a mixture of:
A) Copper and zinc
B) Iron and carbon
C) Gold and silver
D) Copper and tin
Answer: A
10. A solution is a:
A) Heterogeneous mixture
B) Homogeneous mixture
C) Compound
D) Suspension
Answer: B
11. In a solution, the substance present in larger amount is called:
A) Solute
B) Solvent
C) Residue
D) Filtrate
Answer: B
12. The substance that dissolves in a solvent is called:
A) Solute
B) Solvent
C) Sediment
D) Mixture
Answer: A
13. Which mixture shows Tyndall effect?
A) True solution
B) Compound
C) Colloid
D) Element
Answer: C
14. Milk is an example of:
A) True solution
B) Suspension
C) Colloid
D) Element
Answer: C
15. Which of the following can be separated by a magnet?
A) Sugar and salt
B) Sand and iron filings
C) Oil and water
D) Salt and water
Answer: B
16. The process of settling down heavier particles in a liquid is called:
A) Filtration
B) Evaporation
C) Sedimentation
D) Distillation
Answer: C
17. Decantation is used after:
A) Distillation
B) Sedimentation
C) Sublimation
D) Chromatography
Answer: B
18. Which mixture can be separated by evaporation?
A) Sand and water
B) Salt and water
C) Oil and water
D) Iron and sulfur
Answer: B
19. Which of the following is NOT a mixture?
A) Air
B) Bronze
C) Water
D) Soil
Answer: C
20. Bronze is a mixture of:
A) Copper and zinc
B) Copper and tin
C) Iron and carbon
D) Gold and copper
Answer: B
21. The components of a homogeneous mixture are:
A) Visible separately
B) Uniformly distributed
C) Chemically bonded
D) Settled at bottom
Answer: B
22. Which of the following is a suspension?
A) Salt in water
B) Sugar in water
C) Chalk powder in water
D) Vinegar
Answer: C
23. Chromatography is used to separate:
A) Insoluble solids
B) Colored components
C) Heavy metals
D) Magnetic materials
Answer: B
24. Oil and water can be separated using:
A) Magnet
B) Evaporation
C) Separating funnel
D) Chromatography
Answer: C
25. The boiling point of a solution compared to pure solvent is usually:
A) Lower
B) Same
C) Higher
D) Zero
Answer: C
26. Which of the following is a gaseous mixture?
A) Steel
B) Air
C) Salt solution
D) Soil
Answer: B
27. An example of solid-solid mixture is:
A) Air
B) Salt water
C) Alloy
D) Milk
Answer: C
28. The process of converting solid directly into gas for separation is:
A) Sublimation
B) Filtration
C) Sedimentation
D) Decantation
Answer: A
29. Which property remains unchanged in a mixture?
A) Chemical identity of components
B) Color
C) Boiling point
D) Density
Answer: A
30. Which of the following best describes a mixture?
A) Fixed composition
B) New substance formed
C) Variable composition
D) Chemical formula
Answer: C