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Q. Which of the following metals may be present in the anode mud during electrorefining of copper?
I. Gold
II. Iron
III. Silver
IV. Magnesium

General Principles and Processes of Isolation of Elements

Solution:

In the electrolytic refining of copper, precious elements such as $Ag , Au , Sb , Sn , Pt$, etc. are found in the anode mud.