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When a crystal of potassium permanganate is placed at the bottom of water in a beaker, the water in the whole beaker turns purple on its own, even without stirring. This is an example of :(a) distribution (b) intrusion (c) diffusion (d) effusion
Correct Answer: (c) diffusion
Explanation: When the crystals of potassium permanganate are kept in water, the purple-coloured crystals of potassium permanganate break further into smaller particles that occupy the space between the molecules of water imparting a purple colour to the water. This is an example of diffusion.
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