Question

Co2 exist as a gas at room temperature but Si O2 is high melting point solid explain​

Answer 1

Carbon dioxide is simple molecular. Silicon dioxide is giant molecular. Despite the fact that they are both dioxides, is structurally closer to diamonds and more similar to oxygen and nitrogen ( and both has van der Waal's forces) . ... CO2 is a gas while SiO2 is solid at room temperature.

Answer 2

Carbon dioxide is simple molecular. Silicon dioxide is giant molecular.

In CO2

(displayed formula: O=C=O), each molecule is attracted to other molecules due to what is called “van der Waal’s forces” or London forces. van der Waal’s forces is a very weak form of intermolecular force where temporary and induced dipoles attract one another. van der Waal’s forces are very weak and can be broken with little energy. Thus carbon dioxide melts at just over -56.6 degrees Celcius

In SiO2

, every silicon atom is bonded (covalent) to four oxygen atoms. Every oxygen atom is bonded to two silicon atoms. This forms a giant, tetrahedral structure much like a diamond. All the atoms are interconnected by covalent bonds, making the lattice incredibly strong. This is proven by the fact that SiO2

has a melting point of 1713 degrees Celcius (Iron melts at 1538 degrees Celcius)

Despite the fact that they are both dioxides, SiO2

is structurally closer to diamonds and CO2 more similar to oxygen and nitrogen (O2 and N2 both has van der Waal’s forces) . It is all due to differences in bonding.