question_answer 10)

 Name the common elements present in anode mud in the electro-refining of copper, which get collected as anode mud. Why are they so present?

Answer:

Anode mud contains metals like Ag, Au and Pt which are less reactive than Cu. Actually, they are not in a position to lose electrons though they constitute the electrode which acts as anode. Both these metals are left as residue (anode mud) while the entire copper present partilin the oxidation half reaction. Cu(s)   Cu2+ (aq) + 2e?