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Explain the following : CO_2is a gas whereas SiO_2 is a solid. |
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Answer» Solution :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 carbon atom are involved in `ppi- ppi` BONDING with oxygen atom. This results in its linear shape with both C-O bonds of equal length (115 pm)] with no dipole moment. `O=C=O hArr .^(-)O- C-=O^(+) hArr O^(+)-=C-O^-` Silicon 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 to 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. 
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