Consider the following statements: 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

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Statement I is correct. Both colloids and suspensions are heterogeneous mixtures, even though colloids may appear homogeneous to the naked eye. Statement II is correct. The particles of a colloid are too small to be separated by ordinary filtration, but they can be separated using the process of centrifugation. Statement III is incorrect. While the particles of a suspension are large enough to be seen by the naked eye, the particles of a colloid are too small to be individually seen by the naked eye. Statement IV i