Polling process is employed for the removal of:

C u_{2} O f r o m C u

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A l_{2} O_{3} f r o m A l

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F e_{2} O_{3} f r o m F e

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None of the above.

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Solution

The correct option is D $C u_{2} O f r o m C u$
Polling is a metallurgical method employed in the purification of copper which contains cuprous oxide as an impurity.
In the past, freshly cut trees were used as wooden poles. The sap in these poles acted as the reducing agent. The heat of the copper makes the pole emit a gas that reduces the cuprous oxide to copper.

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