JEE Main · 2021 · 31 Aug 2021 · Shift 2 · General Principles and Processes of Isolation of Metals

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In the electrolytic refining of blister copper, the total number of main impurities, from the following, removed as anode mud is ______.
Pb, Sb, Se, Te, Ru, Ag, Au and Pt

Answer: 6

Solution

During electrolytic refining the copper anode dissolves, and only impurities more easily oxidised than copper pass into solution, while those less reactive than copper are not oxidised and collect below the anode as anode mud. From the list, selenium, tellurium, ruthenium, silver, gold and platinum are less reactive than copper and settle as anode mud, whereas the more reactive lead and antimony dissolve. The number of impurities removed as anode mud is

6

JEE Main · 2021 · 31 Aug 2021 · Shift 2 · Integer answer

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