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Carbon dioxide is a gas silica is a soli...

Carbon dioxide is a gas silica is a solid because:

A

Carbon dioxide is composed of discrete covalent`CO_2` molecules, whereas silica has continuous tetrahedral structure.

B

`CO_2` molecules are lighter than `SiO_2` molecules

C

`CO_2` is more acidic than `SiO_2`

D

Melting point of silica is very high

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The correct Answer is:
A
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