Explain the following reactions

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p-blockelements

#1

Explain the following reactions. .
(i) Silicon is heated with methyl chloride at high temperature in the presence of copper.
(ii) Silicon dioxide is treated with hydrogen fluoride.
(iii) CO is heated with ZnO.


#2

(i) When Si is heated with $CH { 3 }Cl$ at high temperature in the presence of Cu as a catalyst, a mixture of mono-, di- and trimethylchlorosilanes along with a small amount of tetramethylsilane is formed.

(ii) When $Si{{O}
{2}}$ reacts with HF, silicon tetrafluoride is formed which dissolves in HF to from hydrofluorosilicic acid.

(iii) CO is a strong reducing agent but it cannot reduce ZnO as for CO—> ${{CO}{2}}$
${{∆}
{r}}$G° is always higher than that of ZnO. Thus, no reaction takes place.