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Roasting is a process in which the ore (mostly sulphide) is heated strongly in the presence of excess of air. The heating should be done at a temperature below the melting point of the ore. Sometimes roasting may not bring about complete oxidation : `2CuFeS_(2) + 4O_(2) rarr A + 2FeO + 3SO_(2)` Find the `A` :A. `Cu_(2) O`B. `CuO`C. `Cu_(2) O`D. `CuS`

Answer» Correct Answer - C
`2CuFeS_(2) + 4O_(2) rarr underset((A)) (Cu_(2)S + 2FeO + 3SO_(2)`
Hence, `(A)` is `Cu_(2) S`.


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