Question

Give reasons for the following observations :-

a) Napthalene balls disappear with time without leaving and solid .

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



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Answer 1

Answer:

(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.

Answer 2

Answer:

Naphthalene undergoes sublimation easily, i.e., the change of state of naphthalene from solid to gas without the intervention of the liquid state. Thus, naphthalene balls keep forming naphthalene vapours that