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  The fragrance produced due to burning of incense stick is due to movement of gaseous vapours produced rapidly in all directions. To demonstrate motion of particles of solid matter (a) Drop a crystal of copper sulphate or potassium permanganate into a glass of hot water. (b) Do not stir the solution and allow the crystals to settle at the bottom,                                                (c) The colour of the solid is seen spreading slowly. (d) This is because the solid particles diffuse in the water.                                                           (5)  

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