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30/09/2021 4:16 pm
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(a) Name the method by which aluminium metal is extracted.
(b) Give the name and chemical formula of one ore of copper.
(c) How is zinc extracted from its carbonate ore (calamine)? Explain with equations.
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30/09/2021 4:20 pm
(a) Electrolytic reduction .
(b)Copper glance (Cu2S)
(c) When calamine ore is heated strongly in the absence of air i.e. calcined, it decomposes to form zinc oxide and carbon dioxide.
ZnCO3(s) + Calcination → ZnO(s) + CO2(g)
Then, zinc oxide is heated with carbon and zinc metal is produced.
ZnO(s) + C(s) → Zn(s) + CO(g)