Homogeneous Mixtures MCQs Quiz | Class 9
This Class IX Science (Code 086) quiz covers Unit I: Matter – Its Nature and Behaviour. Test your understanding of homogeneous mixtures, including their definition, characteristics, and examples. Click “Submit Quiz” to check your score and download the PDF answer key.
Understanding Homogeneous Mixtures
A homogeneous mixture is a mixture in which the components are uniformly distributed throughout the mixture. The composition is uniform throughout, meaning you cannot distinguish one component from another with the naked eye.
Key Characteristics
- Uniform Composition: The substance looks the same throughout.
- No Visible Boundaries: There is no separation between the mixed components.
- Particle Size: The particles are very small (less than 1 nanometer in diameter) and cannot be seen by the naked eye.
- Stability: The solute particles do not settle down when left undisturbed.
- Filtration: Components cannot be separated by simple filtration.
Common Examples
Homogeneous mixtures are commonly referred to as solutions. They can exist in various phases:
| Type of Solution | Solute | Solvent | Example |
|---|---|---|---|
| Solid in Liquid | Sugar | Water | Sugar Solution |
| Gas in Gas | Oxygen/Argon | Nitrogen | Air |
| Solid in Solid | Zinc | Copper | Brass (Alloy) |
| Liquid in Liquid | Alcohol | Water | Vodka/Ethanol mix |
| Solid in Liquid | Iodine | Alcohol | Tincture of Iodine |
Quick Revision Points
- Alloys: Mixtures of two or more metals, or a metal and a non-metal, are considered homogeneous mixtures (e.g., Brass, Bronze, Steel).
- True Solutions: These do not scatter a beam of light passing through them (Tyndall effect is absent) because the particles are too small.
Extra Practice Questions
- What is the solvent in a tincture of iodine? (Answer: Alcohol)
- Why is air considered a homogeneous mixture? (Answer: Gases are uniformly mixed)
- Can you separate salt from water by filtration? (Answer: No)
- What is the approximate size of particles in a true solution? (Answer: Less than 1 nm)
- Is milk a homogeneous mixture? (Answer: No, it is heterogeneous/colloidal)
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