If impurities can be oxidized more easily than the metal itself, which method is used?

Liquation method

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Distillation method

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Oxidation method

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None of these

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Solution

The correct option is C Oxidation method
Oxidation process refers to a set of chemical treatment procedures designed to remove organic and inorganic materials in water and waste water by oxidation through reactions by hydroxyl ions.
Oxidation method is used when impurities are easily oxidisable. For example, lead as an impurity in silver is removed by heating, the impurity is easily oxidised to $P b O$ and removed by air.

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