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Discuss the importance of decomposition ...

Discuss the importance of decomposition reaction in metal industry with three points.

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(i) Molten `NaCl` is electrolytically decomposed to form sodium metal.
(ii) Aluminium metal is obtained by electric decomposition of bauxite ore mixed molten Cryolite.
(iii) Carbonate ores are thermally decomposed to give metal oxides which can be reduced to give metal.
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