Get it on Google Play
Q3. Give reason for the following observations:

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

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

Answer :

(a) Naphthalene balls disappear with time without leaving any solid because they undergo sublimation at room temperature where they directly get converted from a solid to a gaseous state.



(b) We can get the smell of perfume while sitting several metres away because perfume contain volatile solvents which gets diffuses over a distace.