The question was posed to me at a job interview.
My question is from Extraction of Crude Metal from Concentrated Ore in portion General Principles and Processes of Isolation of Elements of Chemistry – Class 12
For explanation I would say: The statement is true. Copper is extracted by hydrometallurgy from low grade copper ores. It is leached out using acid or bacteria.The conversion of copper consists of a series of physical and electrochemical processes. The solution containing Cu^2+ is treated with scrap iron, zinc or hydrogen.