Explain the following:
(A) CO2 is a gas whereas SiO2 is a solid.
(B) Silicon forms SiF62− ion whereas corresponding fluoro-compound of carbon is not known.
Explain the following:
(A) CO2 is a gas whereas SiO2 is a solid.
(B) Silicon forms SiF62− ion whereas corresponding fluoro-compound of carbon is not known.
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1 Answer
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This is a Short Answers Type Questions as classified in NCERT Exemplar
(A) Carbon has small size and large electronegativity, it forms strong n−pπ bonding with two oxygen atoms forming a separate CO2 molecule.
While in SiO2 silicon is larger in size with comparatively less electronegativity than carbon it shows no tendency to form n−pπ bonding rather forms Single covalent bond with oxygen. Thus, SiO2 possess 3D network-like structure in which each Silicon is bonded to 4 oxygen atoms.
(B) Carbon is smaller in size and lacks d-orbitals hence can have a maximum coordination number of four and sp3 hybridisation
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