Carbon dioxide is a gas but silica is a solid because:

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CO2 molecules are lighter than SiO2 molecules

carbon dioxide is composed of discrete covalent CO2 molecules whereas silica has continuous tetrahedral structure

CO2 is more acidic than SiO2

melting point of silica is very high

answer is B.

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Detailed Solution

SiO2 has giant molecular structure where as CO2 has simple molecular structure.

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