Chemistry - Complete Pblock- Question with Solution | TestHub

$\mathrm{S}\mathrm{i}{\mathrm{O}}_2$has three-dimensional network of$\mathrm{S}\mathrm{i}-\mathrm{O}$bonds; whilst carbon dioxide consists of discrete$\mathrm{C}{\mathrm{O}}_2$molecules .$\mathrm{S}\mathrm{i}{\mathrm{O}}_2$is solid, whereas$\mathrm{C}{\mathrm{O}}_2$is a gas.
B. Because of its great affinity for oxygen, Si always occurs as the oxide, silica$\left(\mathrm{S}\mathrm{i}{\mathrm{O}}_2\right)$or in the form of silicates, which are the compounds of$\mathrm{S}\mathrm{i}{\mathrm{O}}_2$with other metal oxides.
C.$\mathrm{S}\mathrm{i}{\mathrm{O}}_2+2\mathrm{M}\mathrm{g}\to \mathrm{S}\mathrm{i}+2\mathrm{M}\mathrm{g}\mathrm{O}$
D. the reluctance of silicon to form$\mathrm{p}\mathrm{\pi }-\mathrm{p}\mathrm{\pi }$bonds to itself is clearly shown by the fact that silicon does not exists in graphite-like structure, but only in diamond like structure.