I. A colloid and a suspension are heterogeneous mixtures.
II. Colloids can be separated from the mixture by the process of centrifugation.
III. Particles of colloids and suspensions can be seen by naked eye.
IV. The aqueous solution of copper sulphate does not show Tyndall effect; however, the mixture of milk and water shows Tyndall effect.
Which of the statements given above is/are correct?
I, II and IV
To determine the correct statements, let's analyze each given statement:
- Statement I: A colloid and a suspension are heterogeneous mixtures.
Explanation: Both colloids and suspensions are indeed heterogeneous mixtures. In such mixtures, the composition is not uniform throughout, and different components can be identified physically. Therefore, Statement I is correct. - Statement II: Colloids can be separated from the mixture by the process of centrifugation.
Explanation: Centrifugation is a technique that uses centrifugal force to separate components based on their densities. Colloidal particles, being larger than those in a true solution, can indeed be separated using centrifugation. Thus, Statement II is correct. - Statement III: Particles of colloids and suspensions can be seen by naked eye.
Explanation: While the particles in suspensions are large enough to be seen with the naked eye, colloidal particles are not visible without the aid of a microscope. Therefore, Statement III is incorrect. - Statement IV: The aqueous solution of copper sulphate does not show Tyndall effect; however, the mixture of milk and water shows Tyndall effect.
Explanation: The Tyndall effect is the scattering of light by particles in a colloid. Copper sulphate solution does not show this effect because it is a true solution with particle sizes too small to scatter light. Milk, being a colloid, does scatter light and hence shows the Tyndall effect. Therefore, Statement IV is correct.
Therefore, the correct statements are I, II, and IV.
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