Answer:
(a) When
methyl chloride reacts with silicon in the presence of copper as a catalyst at
a temperature of\[300{}^\circ C\], various types of methyl substituted chlorosilanes
of formula \[C{{H}_{3}}SiC{{l}_{3}}\],
\[{{(C{{H}_{3}})}_{2}}SiC{{l}_{2}},{{(C{{H}_{3}})}_{3}}SiCl\]and\[{{(C{{H}_{3}})}_{4}}Si\]
(very
small amount) are formed.
\[C{{H}_{3}}Cl+Si\xrightarrow[300\,{}^\circ
C]{Cu\,powder}C{{H}_{3}}SiCl\]
\[+{{(C{{H}_{3}})}_{2}}SiC{{l}_{2}}+{{(C{{H}_{3}})}_{3}}SiCl+{{(C{{H}_{3}})}_{4}}Si\]
(b) The reduction of \[ZnO\]into Zn metal occurs.
\[ZnO+CO\to Zn+C{{O}_{2}}\]
(c) Silica reacts with hydrogen fluoride and forms silicon
tetrafluoride. \[Si{{F}_{4}}\] further reacts with HF and forms
hydrofluorosilicic acid.
\[Si{{O}_{2}}+4HF\to Si{{F}_{4}}+2{{H}_{2}}O\]
\[Si{{F}_{4}}+2HF\to {{H}_{2}}Si{{F}_{6}}\]
(d) Hydrated alumina dissolves to form sodium meta-aluminate.
\[A{{l}_{2}}{{O}_{3}}\cdot
2{{H}_{2}}O+2NaOH\xrightarrow{Heat}2NaAl{{O}_{2}}+2{{H}_{2}}O\]
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