Question

$CO_{2}$ is a gas while $SiO_{2}$ is a solid. Explain.

Answer 1

SiO2 is commonly called silica (sand) . SiO2 is not a linear compound. It net like structure. That is one Si atom are bonded with 4 oxygen atoms and each oxygen atom are bonded with another Si atom.all bonds are sigma bond( single bond only)so SiO2 is sp3 hybridisation ( hybridisation is mixing of atomic orbital with different energy ,shape, orientation to get atomic orbital with same energy ,shape,orientation)

“Hybridisation can easily get in stectural formula ,that is number of sigma bond = number of atomic orbital hybridised

CO2 is linear molecule with zero dipole moment ( due to linear structure) C and O Bond is double bond .in that double bond one is sigma and other is pi bond. hybridisation of CO2 is so

Due to difference in hybridisation and structure SiO2 and CO2 are found in two defferent state.

AND::

Intermolecular forces. Silicon dioxide is really strange with its shape. You'd assume it to be linear like carbon dioxide but it holds a more tetrahedral orientation. This polarizes the molecule and helps them form complex chains of silicon dioxide. It's hard to find black and white information on this as many articles will contradict each other. But we do use silica as a polar surface for TLC and glass does have a slight attraction to water.

So I guess that's the answer. Silicon dioxide is polar. Carbon dioxide is not.

i hope it will helps you friend

Answer 2

C has single atom for bonding and left with no electron but Si has single bonding and leave 8 elections...
I hope it will help you dear...