Silicon is the second most abundant element (~27.2%)in the earth's after oxygen (45.5 %) Carbon. Silicon, germanium, tin and lead constitute the group 14 of the periodic table. Chemistry of silicon is distinctly different from that of carbon. For example, under standard conditions CO_(2) is a gas whereas SiO_(2) is a covalent solid. Glass, made of SiO_(2),Na_(2)SiO_(3) and CaSiO_(3) is attacked by hydrofluoric acid with formation of SiF_(6)^(2-) anion. The analogous CF_(6)^(2-) anion does not exist. The reason/s is/are : (a)carbon is more electronegative than silicon (b)silicon has larger atomic size than carbon (c)silicon has 3d orbitals which form an sp^(3)d^(2) hybrid orbitals (d)carbon and fluorine have comparable atomic sizes

Silicon is the second most abundant element (~27.2%)in the earth's aft

1.	Silicon is the second most abundant element (~27.2%)in the earth's after oxygen (45.5 %) Carbon. Silicon, germanium, tin and lead constitute the group 14 of the periodic table. Chemistry of silicon is distinctly different from that of carbon. For example, under standard conditions CO_(2) is a gas whereas SiO_(2) is a covalent solid. Glass, made of SiO_(2),Na_(2)SiO_(3) and CaSiO_(3) is attacked by hydrofluoric acid with formation of SiF_(6)^(2-) anion. The analogous CF_(6)^(2-) anion does not exist. The reason/s is/are : (a)carbon is more electronegative than silicon (b)silicon has larger atomic size than carbon (c)silicon has 3d orbitals which form an sp^(3)d^(2) hybrid orbitals (d)carbon and fluorine have comparable atomic sizes
Answer» ANSWER :A::B::C::D