Direction: Read the following and answers the questions.A homogeneous...
Tyndall effect, also called Tyndall phenomenon, scattering of a beam of light by a medium containing small suspended particles. E.g., smoke or dust in a room, which makes visible a light beam entering a window. The effect is named for the 19th-century British physicist John Tyndall, who first studied it extensively.
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Direction: Read the following and answers the questions.A homogeneous...
Suspensions and Colloids show tyndall effect because there particles size are enough big to scatter a beam of light
Direction: Read the following and answers the questions.A homogeneous...
Explanation:
The Tyndall effect refers to the scattering of light by particles in a medium. It is named after the Irish physicist John Tyndall, who first observed this phenomenon. The Tyndall effect is used to distinguish between true solutions, suspensions, and colloids.
True Solutions:
- A true solution is a homogeneous mixture where the solute particles are uniformly dispersed and do not settle out.
- True solutions consist of solute and solvent, and the particle size is less than 1 nanometer.
- Since the particle size is very small, true solutions do not scatter light and therefore do not show the Tyndall effect.
- Therefore, the statement "True solutions show Tyndall effect" is incorrect.
Suspensions:
- A suspension is a heterogeneous mixture in which the solute particles do not dissolve but remain suspended throughout the bulk of the medium.
- Suspensions have larger particle sizes compared to true solutions, usually more than 1 micrometer.
- Due to the large particle size, suspensions scatter light and show the Tyndall effect.
- Therefore, the statement "Suspensions show Tyndall effect" is correct.
Colloids:
- A colloid is a mixture that is actually heterogeneous but appears to be homogeneous as the particles are uniformly spread throughout the solution.
- Colloids have intermediate particle sizes between true solutions and suspensions, typically between 1 nanometer and 1 micrometer.
- Like suspensions, colloids also scatter light due to the larger particle size and show the Tyndall effect.
- Therefore, the statement "Colloids show Tyndall effect" is correct.
Conclusion:
- Based on the above explanations, option 'D' is the correct answer because both suspensions and colloids show the Tyndall effect, while true solutions do not.
- True solutions do not scatter light because their particle size is very small (less than 1 nanometer).
- On the other hand, suspensions and colloids have larger particle sizes and scatter light, resulting in the Tyndall effect.
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