Questions About Suspensions
Multiple-Choice Questions – Suspensions
1. What best defines a suspension?
A) A homogeneous mixture of gases
B) A solution that contains only ions
C) A heterogeneous mixture with visible particles that settle
D) A liquid with dissolved atoms
E) A gas dissolved in a solid
2. Which of the following is an example of a suspension?
A) Saltwater
B) Vinegar
C) Blood
D) Sugar solution
E) Air
3. What happens to the particles in a suspension over time?
A) They dissolve permanently
B) They form chemical bonds
C) They settle due to gravity
D) They evaporate
E) They react with light
4. Which method best separates the components of a suspension?
A) Distillation
B) Crystallization
C) Filtration
D) Evaporation
E) Sublimation
5. Which of the following is not a characteristic of a suspension?
A) Heterogeneous mixture
B) Particles visible to the naked eye
C) Can be separated by filtration
D) Particles never settle
E) Appears cloudy or murky
6. In a suspension, what type of particle size is typical?
A) Atomic
B) Molecular
C) Between 1–1000 nm
D) Less than 1 nm
E) Greater than 1000 nm
7. Which of the following distinguishes a suspension from a colloid?
A) Colloids have larger particles
B) Suspensions are always colorless
C) Suspensions settle over time
D) Colloids can be filtered easily
E) Suspensions cannot be seen
8. Muddy water is an example of a:
A) Solution
B) Colloid
C) Suspension
D) Pure substance
E) Homogeneous mixture
9. What causes the particles in a suspension to settle?
A) Surface tension
B) Centripetal force
C) Gravitational force
D) Magnetic attraction
E) Static electricity
10. Which of the following can you use to keep a suspension stable for longer?
A) Heating it
B) Adding more solute
C) Stirring constantly
D) Cooling to freezing
E) Adding a precipitate
11. What is the Tyndall effect, and how does it apply to suspensions?
A) The scattering of light, which is strong in suspensions
B) A filtering technique
C) A way to heat mixtures
D) It only applies to gases
E) A type of chemical reaction
12. Which of the following is not likely to form a suspension?
A) Sand in water
B) Flour in water
C) Oil in water (shaken)
D) Salt in water
E) Chalk in water
13. What happens when a suspension is left undisturbed?
A) It forms a solution
B) It separates into layers
C) It reacts with air
D) It becomes a colloid
E) It gains mass
14. Why is orange juice with pulp considered a suspension?
A) The sugar dissolves completely
B) The pulp floats due to surface tension
C) The pulp is visible and settles
D) It forms ions in water
E) It changes color over time
15. Which of the following best describes the optical appearance of a suspension?
A) Clear and transparent
B) Always opaque
C) Uniform and colorless
D) Cloudy or murky
E) Reflective and metallic
16. Which statement is true about the stability of suspensions?
A) They never separate
B) They always react with water
C) They require constant agitation to stay mixed
D) They form crystals
E) They dissolve all solids
17. What is a medical example of a suspension?
A) IV saline solution
B) Syrup with dissolved sugar
C) Cough syrup with visible particles
D) Alcohol solution
E) Carbonated water
18. How does temperature generally affect suspensions?
A) Higher temperatures always dissolve particles
B) Temperature has no effect
C) High temperature can speed up settling
D) Heat always increases solubility
E) Cooling dissolves suspended solids
19. Suspensions differ from solutions mainly because:
A) Suspensions are colorless
B) Suspensions are homogeneous
C) Suspensions contain undissolved particles
D) Suspensions are chemically bonded
E) Suspensions emit light
20. What is the best way to test whether a mixture is a suspension?
A) Smell the mixture
B) Observe particle movement under a microscope
C) Shake and observe if particles settle later
D) Measure the temperature
E) Taste the mixture
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Answers with Explanations
1. C – A suspension is a heterogeneous mixture with large particles that settle over time.
2. C – Blood is a suspension (cells suspended in plasma).
3. C – Particles in a suspension settle over time due to gravity.
4. C – Filtration is ideal because particles in suspensions are large enough to be trapped.
5. D – Suspension particles do settle; unlike colloids.
6. E – Suspension particles are greater than 1000 nm.
7. C – Suspensions settle, while colloids do not.
8. C – Muddy water has visible particles that settle → it’s a suspension.
9. C – Gravity causes settling in suspensions.
10. C – Constant stirring helps keep a suspension mixed temporarily.
11. A – The Tyndall effect is visible scattering of light by particles (strong in suspensions).
12. D – Salt dissolves completely → forms a solution, not a suspension.
13. B – Suspensions separate into layers when undisturbed.
14. C – The pulp in orange juice is visible and settles → suspension.
15. D – Suspensions are typically cloudy or murky in appearance.
16. C – Suspensions need agitation to keep particles evenly spread.
17. C – Many cough syrups are suspensions with particles you can see.
18. C – Higher temperatures can increase the rate at which particles settle.
19. C – Suspensions contain undissolved particles, unlike solutions.
20. C – Shaking and observing settling is a simple test for suspension behavior.
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