27. When a crystal of potassium permanganate is placed in a beaker, its purple colour spreads throughout water. What does this observation tell us about the nature of potassium permanganate and water?
28. When a gas jar containing air is inverted over a gas jar containing bromine vapour, the red-brown bromine
vapour diffuse into air. Explain how bromine vapour diffuse into air.
29. Describe in your own words, what happens to the particles when salt dissolves in water.

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