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Extraction of Aluminium

A metal 'M' w...

Question

A metal 'M' which is one of the best conductor of heat and electricity is used in making electric wires is found in nature as sulphide ore $M_{2} S$ ?
(i) Name the metal 'M'.
(ii) Which process will be suitable for extraction of this metal M from its ore $M_{2} S$ ? Write the balanced chemical reactions involving in the process of extraction. With the help of a labelled diagram, explain the process of electrolytic refining of the metal.

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Solution

i) The metal is Silver.
ii) It is extracted by the following process.
Reactions: a) $A g_{2} S + 4 N a C N \to 2 N a [A g (C N)_{2}] + N a_{2} S$
b) $4 N a_{2} S + 2 H_{2} O + 5 O_{2} \to 2 N a_{2} S O_{4} + 2 N a O H + 2 S$
c) $2 N a [A g (C N)_{2}] + Z n \to N a_{2} [Z n (C N)_{4}] + 2 A g ↓$

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