Question

give reason for following objective

a) Naphthalene balls disappear with time without leaving any solid
b)We can get the smell of perfume sitting several metres away

Answer 1

A napthelene balls disappear due to sublimation
we can get smell of perfume cause it evaporate in vapours with smell

Answer 2

(a): Naphthalene balls disappear with time without leaving any solid because they undergo sublimation i.e., they directly change into vapour without passing through the liquid state.

(b): We can get the smell of perfume sitting several metres away due to diffusion. The perfumes contain solvent which carries pleasant smelling vapour. They diffuse quite fast and can reach a person sitting several metres away.

Hope it will help you
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