Explain the following reactions.
(a) Silicon is heated with methyl chloride at high temperature in the presence of copper.
(b) Silicon dioxide is treated with hydrogen fluoride.
(c) CO is heated with ZnO.
(d) Hydrated alumina is treated with aqueous NaOH solution.

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Solution

(a) Silicon is heated with methyl chloride at high temperature in the presence of copper catalyst at 537 K, methyl substituted chlorosilanes $M e S i C l_{3}, M e_{2} S i C l_{2}, M e_{3} S i C l$ and $M e_{4} S i$ are formed.
(b) When silicon dioxide is treated with hydrogen fluoride, first $S i F_{4}$ is formed and then hydro fluorosilicic acid is obtained.
$S i O_{2} + 4 H F \to S i F_{4} + 2 H_{2} O$
$S i F_{4} + 2 H F \to H_{2} S i F_{6}$
(c) When CO is heated with ZnO, ZnO is reduced to Zn metal.
$C O + Z n O Δ - \to C O_{2} + Z n$
(d) When hydrated alumina is treated with aqueous NaOH solution, it dissolves to form sodium meta aluminate.
$A l_{2} O_{3} .2 H_{2} O + 2 N a O H \to 2 N a A l O_{2} + 3 H_{2} O$

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Explain the following reactions

(a) Silicon is heated with methyl chloride at high temperature in the presence of copper;

(b) Silicon dioxide is treated with hydrogen fluoride;

(d) Hydrated alumina is treated with aqueous NaOH solution.

Explain the following reactions

(a)Silicon is heated with methyl chloride at high temperature in the presence of copper;

(b)Silicon dioxide is treated with hydrogen fluoride;

(d)Hydrated alumina is treated with aqueous NaOH solution.

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