Tick(√) the most appropriate answer:
Gases have:

Infinite free surface

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Two free surfaces

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Only one free surfaces

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No free surface

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Solution

The correct option is D
No free surface

Explanation for the correct answer:
(D) No free surface
Gases are fluids that have the least intermolecular forces of attraction hence, they have highest intermolecular spaces in comparison to solids & liquids.
Since, they flow freely in all directions occupying the entire free space they get to fill in so, to hold them we need a closed container.
Explanation for the incorrect options:
Solids have a definite shape and definite volume due to strong inter-molecular forces of attraction. They do not require any container to hold the particles intact hence, they have infinite free surfaces
Liquids can flow as they have fewer intermolecular forces of attraction in comparison with solids. So, they require a container to hold them. Hence, they have one free(upper) surface.
Hence, option (D) is correct. Gases have no free surface.

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