Q55 of 160 Page 20

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:

When a crystal of potassium permanganate is placed in a beaker of water, the water slowly turns blue on its own, even without stirring. Both potassium permanganate crystal and water are made up of tiny particles. On dissolving, the particles of potassium permanganate get into the spaces between the particles of water. This process is called diffusion.

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53

(a) Define matter. Give four examples of matter.

(b) What are the characteristics of matter?

 54

(a) What is Brownian motion? Draw a diagram to show the movement of a particle (like a pollen grain) during Brownian motion.

(b) In a beam of sunlight entering a room, we can sometimes see dust particles moving in a haphazard way in the air. Why do these dust particles move?

 56

Which one of the following statement is correct in respect of fluids?

 57

A few substances are arranged in the increasing order of ‘forces of attraction’ between their particles. Which one of the following represents the correct arrangement?