(a) Naphthalene balls disappear with time

(a) Naphthalene balls disappear with time without leaving any solid why?

(b) We can get the smell of perfume sitting several meters away.

(a) Naphthalene is volatile solid and has a tendency to sublime, therefore, it changes into vapours completely which disappear into the air and no solid is left.

(b) This is because perfumes contain volatile solvent which carries pleasant smelling vapours. They diffuse quite fast and can reach to people sitting several meters away

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