Distinguish Solution/Suspension/Colloid MCQs Quiz | Class 9
This Class IX Science (Code 086) Practicals (Unit I) quiz focuses on distinguishing between true solutions, suspensions, and colloids. The questions cover key properties such as transparency, filtration criterion, and stability. Answer the 10 MCQs below to test your understanding, submit to see your score, and download the PDF answer sheet for your records.
Topic Overview: Mixtures in Class 9 Science
In this practical unit, students learn to differentiate between three types of mixtures: true solutions, suspensions, and colloids. The differentiation is based on observable properties such as stability (do particles settle?), transparency (can we see through it clearly?), and filtration (do particles pass through filter paper?).
Key Differences Table
| Property | True Solution | Colloid | Suspension |
|---|---|---|---|
| Particle Size | Very small (less than 1 nm) | Medium (1 nm to 100 nm) | Large (more than 100 nm) |
| Appearance | Transparent | Translucent | Opaque |
| Filtration | Passes through filter paper | Passes through filter paper | Residue left on filter paper |
| Stability | Stable (particles do not settle) | Stable (particles do not settle) | Unstable (particles settle down) |
| Nature | Homogeneous | Heterogeneous (appears homogeneous) | Heterogeneous |
Quick Revision Notes
- True Solution: A mixture like salt in water. It is clear, particles are invisible to the naked eye, and it does not scatter light significantly (no Tyndall effect).
- Suspension: A mixture like chalk powder in water. Particles are visible, the mixture is opaque or cloudy, and particles settle down if left undisturbed.
- Colloid: A mixture like milk or starch solution. It looks stable and uniform but scatters a beam of light (Tyndall effect). Particles are too small to be filtered by ordinary filter paper.
Extra Practice Questions
- Q: Which mixture shows the Tyndall effect clearly?
A: Colloids (and some fine suspensions). - Q: Can a true solution be separated by filtration?
A: No, the particles are too small. - Q: Is fog a colloid or a suspension?
A: Fog is a colloid (liquid in gas). - Q: What happens to a suspension if left undisturbed for 1 hour?
A: The solid particles settle at the bottom. - Q: Which type of mixture is alloy (like brass)?
A: It is a solid solution (homogeneous mixture).
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