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Question

CO2 is gas, while SiO2 is solid because :

A
CO2 is a linear molecule, while SiO2 is angular.
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B
van der Waals' forces are very strong in SiO2.
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C
CO2 is covalent, while SiO2 is ionic.
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D
Si cannot form stable bonds with O, hence Si has to form a 3D lattice.
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Solution

The correct option is C Si cannot form stable bonds with O, hence Si has to form a 3D lattice.
SiO2 is solid because Si cannot form stable bonds with O, hence Si has to form a 3D lattice of SiO2 molecules and form solid structure.

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