Question

a. Which substances form purple fumes on heating .

b. Why in gases diffusion occurs.

Answer 1

Answer:

I don't know

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Answer 2

A. Iodine

More About Iodine :- .Iodine is a non-metallic, dark-gray/purple-black, lustrous, solid element. Iodine is the most electropositive halogen and the least reactive of the halogens even if it can still form compounds with many elements. Iodine sublime easily on heating to give a purple vapour.

B. Gaseous particles tend to undergo diffusion because they have kinetic energy. Diffusion is faster at higher temperatures because the gas molecules have greater kinetic energy. Effusion refers to the movement of gas particles through a small hole.