WHAT HAPPENS WHEN a) Borax is heated strongly b)Silicon dioxide is reacted with HF c) Silicon is heated with Methyl chloride at high temperature in the presence of copper.
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Explanation:
(a) Silicon is heated with methyl chloride at high temperature in the presence of copper catalyst at 537 K, methyl substituted chlorosilanes MeSiCl
3
,Me
2
SiCl
2
,Me
3
SiCl and Me
4
Si are formed.
(b) When silicon dioxide is treated with hydrogen fluoride, first SiF
4
is formed and then hydro fluorosilicic acid is obtained.
SiO
2
+4HF→SiF
4
+2H
2
O
SiF
4
+2HF→H
2
SiF
6
(c) When CO is heated with ZnO, ZnO is reduced to Zn metal.
CO+ZnO
Δ
CO
2
+Zn
(d) When hydrated alumina is treated with aqueous NaOH solution, it dissolves to form sodium meta aluminate.
Al
2
O
3
.2H
2
O+2NaOH→2NaAlO
2
+3H
2
O
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