Questions on Mixtures, Homogeneous and Heterogeneous Mixtures
Multiple Choice Questions – Mixtures, Homogeneous and Heterogeneous Mixtures
1. What is a mixture?
A) A pure element
B) A substance made of only one compound
C) A combination of two or more substances physically combined
D) A chemically bonded compound
E) An unstable isotope
2. Which of the following is a homogeneous mixture?
A) Salad
B) Air
C) Pizza
D) Sand and iron filings
E) Oil and water
3. A heterogeneous mixture can be identified by:
A) Its uniform appearance
B) A single phase throughout
C) A chemical reaction
D) Visible different parts or layers
E) Being a solution
4. Which of the following is not a mixture?
A) Salt water
B) Distilled water
C) Air
D) Vinegar
E) Milk
5. Which term best describes milk?
A) Pure substance
B) Homogeneous mixture
C) Heterogeneous mixture
D) Compound
E) Element
6. A mixture can be separated by:
A) Chemical reactions only
B) Nuclear fission
C) Physical means
D) Electrolysis
E) Decomposition
7. Which of these is a heterogeneous mixture?
A) Salt dissolved in water
B) Brass
C) Vegetable soup
D) Coffee
E) Vinegar
8. A solution is a type of:
A) Heterogeneous mixture
B) Compound
C) Element
D) Homogeneous mixture
E) Pure substance
9. What distinguishes a homogeneous mixture?
A) It contains only one kind of atom
B) It is visible under a microscope only
C) It has the same composition throughout
D) It reacts chemically
E) It forms layers when left standing
10. Which is an example of a homogeneous solid mixture?
A) Granite
B) Bronze
C) Trail mix
D) Ice
E) Coal
11. Which pair is a heterogeneous mixture?
A) Salt + Water
B) Sugar + Water
C) Sand + Water
D) Alcohol + Water
E) Vinegar + Water
12. What is not true about mixtures?
A) They can be separated physically
B) They consist of two or more substances
C) Their components are chemically bonded
D) They can be homogeneous or heterogeneous
E) They retain the properties of the components
13. A homogeneous mixture is also known as a:
A) Suspension
B) Solution
C) Compound
D) Colloid
E) Solute
14. Which of the following is a mixture of gases?
A) Carbon dioxide
B) Air
C) Oxygen
D) Methane
E) Nitrogen
15. What type of mixture is blood considered to be?
A) Pure substance
B) Heterogeneous mixture
C) Homogeneous mixture
D) Compound
E) Element
16. A colloid differs from a solution because:
A) It is always heterogeneous
B) It scatters light
C) It has only one component
D) It cannot mix
E) It separates quickly
17. The term solute refers to:
A) The liquid part of a mixture
B) The substance that does the dissolving
C) The part that is dissolved
D) The gas in a gas mixture
E) The solvent in a solution
18. Which of these can separate a heterogeneous mixture?
A) Distillation
B) Chromatography
C) Filtering
D) Freezing
E) Decomposition
19. Which of the following is a homogeneous mixture in liquid form?
A) Oil and water
B) Vinegar
C) Orange juice with pulp
D) Paint
E) Muddy water
20. A suspension is best described as:
A) A homogeneous mixture
B) A mixture that never separates
C) A type of compound
D) A heterogeneous mixture with large particles
E) A pure substance
21. Which of these best represents a mixture?
A) H₂O
B) NaCl
C) Air
D) CO₂
E) O₂
22. When a substance is evenly mixed with another, it's called:
A) An element
B) A compound
C) A homogeneous mixture
D) A heterogeneous mixture
E) A precipitate
23. What method would be best to separate a salt and sand mixture?
A) Decantation only
B) Magnetism
C) Dissolve in water, filter, evaporate
D) Sublimation
E) Distillation
24. An example of a colloid is:
A) Salt water
B) Milk
C) Iron filings
D) Alcohol
E) Tap water
25. What is the main difference between mixtures and compounds?
A) Mixtures are pure substances
B) Compounds are physically combined
C) Mixtures can be separated physically, compounds cannot
D) Compounds have visible parts
E) Mixtures have fixed ratios
26. Which of these is not a homogeneous mixture?
A) Sugar water
B) Vinegar
C) Steel
D) Sand and salt
E) Air
27. How many phases are visible in a heterogeneous mixture?
A) One
B) None
C) Two or more
D) Infinite
E) Zero
28. In a solution, the substance present in greater quantity is called the:
A) Solute
B) Solvent
C) Residue
D) Filtrate
E) Compound
29. A mixture that settles upon standing is known as a:
A) Solution
B) Homogeneous mixture
C) Suspension
D) Colloid
E) Compound
30. A mixture can be described as:
A) A chemically bonded material
B) A substance with only one element
C) A pure compound
D) A combination of substances with no fixed ratio
E) An ionized substance
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Answer Key with Explanations
1. C) Mixtures are physical combinations of substances.
2. B) Air is uniform throughout; it's a homogeneous gas mixture.
3. D) Heterogeneous mixtures have visibly different components.
4. B) Distilled water is a pure substance.
5. C) Milk is a colloid, which is a type of heterogeneous mixture.
6. C) Mixtures can be separated by physical means like filtration or distillation.
7. C) Vegetable soup has visible parts, making it heterogeneous.
8. D) Solutions are uniform mixtures—homogeneous.
9. C) Homogeneous mixtures have the same composition throughout.
10. B) Bronze is a solid homogeneous alloy of copper and tin.
11. C) Sand and water do not mix uniformly.
12. C) Components in mixtures are not chemically bonded.
13. B) A solution is another name for a homogeneous mixture.
14. B) Air is a mixture of gases like nitrogen, oxygen, and carbon dioxide.
15. B) Blood has cells suspended in plasma—heterogeneous.
16. B) Colloids scatter light (Tyndall effect), unlike solutions.
17. C) A solute is the substance being dissolved.
18. C) Filtering separates solid particles from liquids.
19. B) Vinegar is acetic acid uniformly dissolved in water.
20. D) Suspensions are mixtures where particles eventually settle.
21. C) Air is a mixture of multiple gases.
22. C) Evenly mixed = homogeneous mixture.
23. C) Dissolve salt, filter sand, evaporate to recover salt.
24. B) Milk is a colloid with fat particles dispersed in water.
25. C) Mixtures = physical separation; compounds = chemical separation.
26. D) Sand and salt are not uniformly mixed = heterogeneous.
27. C) Heterogeneous mixtures show two or more visible phases.
28. B) Solvent is the larger component in a solution.
29. C) Suspensions settle over time.
30. D) Mixtures do not have a fixed ratio of components.
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