WBJEE · Chemistry · General Principles and Processes of Isolation of Metals

Roasted copper pyrite on smelting with sand produces

A \(\mathrm{FeSiO}_{3}\) as fusible slag and \(\mathrm{Cu}_{2} \mathrm{S}\) as matte
B \(\mathrm{CaSiO}_{3}\) as infusible slag and \(\mathrm{Cu}_{2} \mathrm{O}\) as matte
C \(\mathrm{Ca}_{3}\left(\mathrm{PO}_{4}\right)_{2}\) as fusible slag and \(\mathrm{Cu}_{2} \mathrm{S}\) as matte
D \(\mathrm{Fe}_{3}\left(\mathrm{PO}_{4}\right)_{2}\) as infusible slag and \(\mathrm{Cu}_{2} \mathrm{S}\) as matte

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Answer & Solution

Correct Answer

(A) \(\mathrm{FeSiO}_{3}\) as fusible slag and \(\mathrm{Cu}_{2} \mathrm{S}\) as matte

Step-by-step Solution

Detailed explanation

Roasted copper pyrite on smelting with sand produces \(\mathrm{FeSiO}_{3}\) as fusible slag and \(\mathrm{Cu}_{2}\) S as matte For removing the gangue, FeS, silica present in the lining of the Bessemer converter, acts as a flux and forms slag (iron silicate) on reaction with…

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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