Give Reason: A Gas fills completely the vessel in which it is kept.

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Solution

Gases
Gases have a negligible intermolecular force of attraction between the particles.
The gaseous particles are loosely bound as a result, the random motion of particles in all directions is experienced in the vessel, so gas fills the vessel in which it is kept.
Therefore, due to no intermolecular force of attraction between particles a gas fills completely the vessel in which it is kept.

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