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` :

Options

A. `Cu_(2) O`
B. `CuO`
C. `Cu_(2) O`
D. `CuS`

Answer

C

Explanation

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