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Redox Reactions and Couple

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Question

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.

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