Which of the following is a colloid?
Which of the following is a colloid?
The correct option is A Smoke
Explanation for the correct option:
(A) Smoke: Smoke is a colloid in which the dispersed phase is solid and dispersion medium is gas.
- Smoke is an example of aerosol.
Colloids: A colloid is a heterogeneous mixture in which the size of the particles is so small that the particles cannot be seen with the naked eye.
- Therefore, it only appears homogeneous but actually it is heterogeneous as the composition is not uniform throughout.
- The diameter of the particles of colloids lies in the range of .
- These particles can scatter a beam of light passing through them and make the path of light visible. This is known as the Tyndall effect.
- Examples of colloids: Milk, mist etc.
Dispersed phase: The phase which consists of the colloidal particles and present in the smaller quantity. In milk, liquid fat globules are the dispersed phase.
Dispersion medium: The phase in which the particles are dispersed and is present in the larger quantity. In milk, water is the dispersion medium.
Explanation for the incorrect options:
(B) Sea water: Sea water is a solution in which salt- mostly Sodium chloride is present in dissolved state. It is an example of solution.
Solution: A solution is a homogeneous mixture of two or more substances.
- When the size of particles is less than 10-9 m or 1 nm in diameter and cannot be seen with the naked eye, it is called as true solution.
- It does not shows the Tyndall effect.
- Tyndall effect: When particles can scatter a beam of light passing through them and make the path of light visible is called the Tyndall effect.
(C) Sugar solution: When Sugar is dissolved in water, sugar solution is obtained. It is also an example of true solution.
(D) Aspirin: Aspirin is a compound in which various elements like Carbon, Hydrogen, Oxygen are present in a fixed ratio in a chemically combined state.
Hence, option (A) is correct.
Smoke
Explanation for the correct option:
(A) Smoke: Smoke is a colloid in which the dispersed phase is solid and dispersion medium is gas.
- Smoke is an example of aerosol.
Colloids: A colloid is a heterogeneous mixture in which the size of the particles is so small that the particles cannot be seen with the naked eye.
- Therefore, it only appears homogeneous but actually it is heterogeneous as the composition is not uniform throughout.
- The diameter of the particles of colloids lies in the range of .
- These particles can scatter a beam of light passing through them and make the path of light visible. This is known as the Tyndall effect.
- Examples of colloids: Milk, mist etc.
Dispersed phase: The phase which consists of the colloidal particles and present in the smaller quantity. In milk, liquid fat globules are the dispersed phase.
Dispersion medium: The phase in which the particles are dispersed and is present in the larger quantity. In milk, water is the dispersion medium.
Explanation for the incorrect options:
(B) Sea water: Sea water is a solution in which salt- mostly Sodium chloride is present in dissolved state. It is an example of solution.
Solution: A solution is a homogeneous mixture of two or more substances.
- When the size of particles is less than 10-9 m or 1 nm in diameter and cannot be seen with the naked eye, it is called as true solution.
- It does not shows the Tyndall effect.
- Tyndall effect: When particles can scatter a beam of light passing through them and make the path of light visible is called the Tyndall effect.
(C) Sugar solution: When Sugar is dissolved in water, sugar solution is obtained. It is also an example of true solution.
(D) Aspirin: Aspirin is a compound in which various elements like Carbon, Hydrogen, Oxygen are present in a fixed ratio in a chemically combined state.
Hence, option (A) is correct.
