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CO2 is a gas but SiO2 is a solid. Give reason.

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CO2 is a gas but SiO2 is a solid. Give reason.

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CO2 exists as discrete molecules due to the formation of pπ -pπ double bond between carbon and oxygen. But SiO2 has a three dimensional network structure in which each Si atom is covalently bonded in a tetrahedral manner to four oxygen atoms.

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