Question

Very Short Answer Type Questions.
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Answer 1

5. This shows the property of diffusion of particles of matter. A small amount of potassium permanganate gets diffused in large amount of solution and impart colour to it.

6. This also shows the property of particles to diffuse in different medium. The molecules of incense stick gets diffuse into the air and it's particle gets carried away by air molecules to different corners of the room.

7. This shows that different matter have different intermolecular force of attraction between molecules in them.

In chalk molecules are loosely bound so get easily broke when jotted with hammer but in case of iron force of attraction between it's molecules are very strong that it does not broke on hammering.

Hope you understand it..............