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Question

In which of the following process fused sodium chloride is electrolysed for extraction of sodium?

A
Castner process
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B
Cyanide process
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C
Downs process
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D
Both (2) and (3)
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Solution

The correct option is C Downs process
On industrial scale sodium metal is extracted by "Down's Process".
PRINCIPLE:Down's Process is based on the electrolysis of fused NaCl.
CONSTRUCTION OF DOWN'S CELL:
  • Down's cell consists of a rectangular container of steel.
  • Inside of the tank is lined with firebricks.
  • Anode is a graphite rod which projects centrally up through the base of the cell.
  • Cathode is a ring of iron, which surrounds the anode.
  • The anode and cathode are separated from each other by a cylindrical steel gauze diaphragm so that Na and Cl2 are kept apart.
  • A bell like hood is submerged over the anode.

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