Question

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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

Answer:

a) 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.

b) We can get the smell of perfume sitting several metres away. Perfume has a higher degree of vaporization, and its vapour diffuses into the air easily. Gaseous particles possess high speed and move very rapidly in all directions.

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Answer 2

Explanation:

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( A )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.

( B ) When perfume is released it quickly changes into vapour. The kinetic energy of gas molecules is high & the rate of diffusion is high. Hence we can smell the perfume sitting several metres away.

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