Question
Explain the following: $CO_2$ is a gas whereas $SiO_2$ is a solid.
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Answer
In $CO_2$, carbon atom undergoes sp hybridization. Two sp hybridized orbitals of carbon atom overlap with two p orbitals of oxygen atoms to make two sigma bonds while other two electrons of carbone atom are involved in $\text{p}\pi-\text{p}\pi$ bonding with oxygen atom. This results in its linear shape[with both C-O bonds of equal length(115 pm) with no dipole moment.
Silicone dioxide is a covalent, three-dimensional network solid in which each silicon atom is covalently bonded in a tetrahedral manner to four oxygen atoms. Each oxygen atom in turn covalently bonded ti another silicon atoms as shown in diagram. Each comer is shared with another tetrahedron. The entire crystal may be considered as giant molecule in which eight membered rings are formed with alternate silicon and oxygen atoms.
Silicone dioxide is a covalent, three-dimensional network solid in which each silicon atom is covalently bonded in a tetrahedral manner to four oxygen atoms. Each oxygen atom in turn covalently bonded ti another silicon atoms as shown in diagram. Each comer is shared with another tetrahedron. The entire crystal may be considered as giant molecule in which eight membered rings are formed with alternate silicon and oxygen atoms.Need a full question paper?
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