11.21. 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.
11.21. 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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1 Answer
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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, Me2→SiCl2→, Me3→SiCl and Me4→Si 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 →+ 2H2→O
SiF4+2HF → H2SiF6
(c) When CO is heated with ZnO, ZnO is reduced to Zn metal.
CO + ZnO →CO2 →+ Zn
(d) When hydrated alumina is treated with aqueous NaOH solution, it dissolves to form sodium meta al...more
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