Assertion:- When the crystal of potassium permanganate is dissolved in water then colour of water turns pink. We put this pink solution in another beaker containing clear water and they are mixed in the ratio of 9:1 (9 parts of clear water to 1 part of pink solution) at every step of dilution then it takes infinite similar steps to get clear water.
Reason:- Particles of matter are too tiny in size.
Both assertion and reason are true and the reason is correct explaination of assertion.
When the crystal of potassium permanganate is dissolved in water then the colour of water becomes pink. As we put this pink solution in another beaker containing clear water and they are mixed in the ratio of 9:1 (9 parts of clear water to 1 part of the pink solution) then at every step of dilution, colour of solution becomes light but it is still visible. It takes an infinite number of steps to obtain a colourless solution. So it proves that there are millions of tiny particles in just one crystal of potassium permanganate which keeps on dividing themselves into smaller and smaller particles.