What is the oxidation state of cu and fe in cufes2
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Solution
The oxidation number of Cu is +1 and Fe is +3 in CuFeS2 is +2. It can be explained as follows CuFeS2= Cu+ Fe+ 2S (+1)+(+3)+2(-2)=0 This can be understood from the evidence that CuFeS2 is giving Cu2S with copper oxidation state +1 on roasting.