The oxidation state of Cu and Fe in CuFeS2 are ________ and _________ respectively
Copper pyrite or CuFeS2 exists as Cu2S. Fe2S3 . The oxidation states of Cu and Fe are nominally considered to be +1 and +3 respectivel
Now that we know how the mineral actually exists, we can easily calculate the required pxidations states. Sulphur exists in its -2 oxidation state as sulphide.
For Cu2S to be neutral, Cu should exist in +1 oxidation state.
Let the oxidation state of Iron be x. In Fe2S3 , since the molecule is neutral:
2(x) + 3(-2) = 0
Solving, we get x = +3