Give reasons for the following.
The size of naphthalene balls decreases when left open for some time.

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Solution

Sublimation is the transition of a substance directly from the solid to the gas state without passing through the intermediate liquid state.
Naphthalene is a solid substance that can be sublimed under atmospheric temperature.
When naphthalene balls are left open, due to sublimation they change to vapours, and their size decreases.

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Similar questions

Why does the size of naphthalene balls decrease when left open?

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.

(a)

(b)

Give reason: why does a naphthalene ball disappear if left in open for some days?

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