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Name the common elements present in the anode mud in electrolytic refining of copper. Why are they so present?

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Name the common elements present in the anode mud in electrolytic refining of copper. Why are they so present?

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The elements antimony, selenium, gold, silver, platinum, etc. are present in the anode mud during refining of copper. These impurities being less electropositive do not undergo oxidation at the anode and hence settle down as such.

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