Question

The final output after processing of copper ores to be purified produces around ____________ pure copper.

(a) 100%

(b) 45%

(c) 99.9%

(d) 86%

I have been asked this question in an interview for job.

The doubt is from Manufacturing Processes of Copper and its Alloys in portion Copper and its Alloys of Aerospace Materials & Processes

Answer 1

Correct option is (c) 99.9%

To elaborate: The amount of copper found in ores is different for different ores. There are also sulfide ores and oxide ores of copper. But, at the end of the extraction process, the copper obtained has a purity of around 99.9%.