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Copper isthemistnobleoffirstrow transitionmetalsandoccursinsmalldepositsinseveralcountries.Oresofcopperinclude chalcanthite(CuSO_4. 5H_ 2O ) ,atacamite(Cu_2Cl (OH) _3 ),cuprite(Cu_ 2 O ), copperglance(Cu_ 2S),andmalachite(Cu_2 (OH)_2CO_3 ) . However, 80 % oftheworldcopperproductioncomesfrom theorechalcopyrite(CuFeS_2) . The extraction ofcopper from chalcopyrite involvespartialroasting,removalofironandself - reductionInself- reduction, thereducingspecies is

Answer»

S
` O ^(2-) `
`S^(2-) `
`SO_2`

Solution :Duringself- REDUCTION, ` Cu_2 S`, i.e.,` S ^( 2 -) `actsas a REDUCING speciesand hencereduces` CU _2 O `tocoppermetal.
` OVERSET (2-)S + 2 Cu_ 2 Oto4 Cu+ SO_2. `


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