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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 common elements present in the anode mud are antimony, selenium, tellurium, silver , gold and platinium. These elements, being less reactive, are not affected by ` Cu SO _ 4 - H _ 2 SO _ 4 ` solution and hence settle down under anode as anode mud.
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