Question

Give reason for the following observations:

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) Naphthalene balls undergo sublimation,a process in which a solid is directly converted into gaseous state without passing through liquid state without leaving any solid
B)We get the smell of perfume sitting several metres away because the particles of perfume diffuse quickly with the air particles present in the atmosphere
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Answer 2

here is ur answer buddy:-

a) naphthalene balls disappear because they change their solid state to gaseous state because of sublimation.
b)we can get smell of perfume sitting several meters away as the particles of gas have large interparticular spaces between them and so they diffuse very rapidly.

hope this helped you.....☺