Question

3 Give reasons for the following observations
a when naphthalene is kept it becomes anything solid over time invisible with out leaving it
b the smell of perfume reaches us even after sitting far away
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Answer 1

Answer:

as naphthalene is a sublimable material so it directly converts from solid to gas and it operates with the environment and spreads near all over in the room or else in any where we are sitting.

Explanation:

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Answer 2

Explanation:

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 disappear into the air with time without leaving any solid.