Question

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in potassium permanganate experiment in cold water the particles in the crystal tend to move upwards but the cold particles of gas produced by cold food cannot travel more distance but in potassium permanganate experiment the particles can travel some distance when they move upwards
i am really confused

Answer 1

This is also happen sometimes due to diffusion

Answer 2

Hey friend
If a solid sample of Potassium permanganate is placed in water, the water molecules will interact with the Potassium cations and the permanganate anions held in the crystal to break the ionic bonds that hold the crystal together. 

This is a process of dissolving the crystal into solution. You will not be able to see the Potassium ions, but the permanganate ions are purple even in solution and you will see the water slowly darken (perhaps turning pink or violet first near the solid and finally taking on a uniform purple color). 
Due to this process taking place, the pungent smell is released.