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Why CO2 is a gas, but SiO2 is a high melting solid?.

Carbon can form multiple bonds, but silicon cannot. The CO2 molecules is linear with zero dipole moment. Thus, the intermolecular forces are very small and it is a gas at room temperature. SiO2 does not have any multiple bonding in Si-O bond, due to large size of silicon. However, it is a giant 3-D network structure in which each Si is linked tetrahedrally to four oxygen atoms. Hence, it is a stable solid.

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