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.

Engineering

Chemistry

The Halogen Family and Properties

Question

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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(a) Silicon is heated with methyl chloride at high temperature in the presence of copper catalyst at 537 K, methyl substituted chlorosilanes MeSiCl₃, Me₂SiCl₂, Me₃SiCl and Me₄Si are formed.
(b) When silicon dioxide is treated with hydrogen fluoride, first SiF₄ is formed and then hydro fluorosilicic acid is obtained.
SiO₂ + 4HF → SiF₄ + 2H₂O
SiF₄ + 2HF → H₂SiF₆
(c) When CO is heated with ZnO, ZnO is reduced to Zn metal.
$CO + ZnO \overset{Δ}{⟶} {CO}_{2} + Zn$
(d) When hydrated alumina is treated with aqueous NaOH solution, it dissolves to form sodium meta aluminate.
Al₂O₃. 2H₂O + 2NaOH → 2NaAlO₂ + 3H₂O

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