Which step is not involved in hydrometal...

Which step is not involved in hydrometallurgical process?

`Cu_(2)S +2Cu_(2)O to 6Cu+SO_(2)`

`CuFeS_(2) +2H_(2)SO_(4) to CuSO_(4) +FeSO_(4) +2H_(2)S`

`CuSO_(4) +Fe to FeSO_(4)+Cu`

`CuCO_(3) +H_(2)SO_(4) to CuSO_(4) +H_(2)O +CO_(2)`

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The correct Answer is:

`Cu_(2)S +2Cu_(2)O to 6Cu+SO_(2)`

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