Chromium - plated steel is a material of popular use. During its process of manufacture, the effluent contains chromate and cyanide ions as impurities. After these are chemically removed, carbon dioxide and salt (sodium chloride) still remain as impurities. This salt solution is purified electrolytically by adding carbonaceous matter which acts as:
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- A microcell.
The above-given salt-solution is purified electrolytically by adding carbonaceous matter which acts as a microcell.
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