Which of the following phenomenon occurs when we open a bottle of perfume and its smell spreads in the entire room with in a short time?

Evaporation

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Sublimation

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Diffusion

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Decantation

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Solution

The correct option is C Diffusion
Diffusion is a process by which the molecules intermingle as a result of their kinetic energy and random motion. These molecules are in constant motion making numerous collisions.

When a perfume is sprayed in one corner of a room, or the fumes from a cooking vessel are released, then, being gaseous in nature, the molecules travel quickly through the entire room and the smell spreads through out the room. This process is called as diffusion.

Hence, option $C$ is correct.

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