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BITSAT2024ChemistryGeneral Principles and Processes of Isolation of MetalsActual

The chemical composition of 'slag' formed during the smelting process in the extraction of copper is

Options

  1. ACu ₂ O + FeS
  2. BFeSiO ₃
  3. CCuFeS ₂
  4. DCu ₂ ~S + FeO

Correct answer

B. FeSiO ₃

Step-by-step solution

During the extraction of copper, iron is present in the ore as impurity (FeS). The ore together with a little coke and silica is smelted; FeS present as impurity in the ore is oxidized to iron oxide, which then reacts with silica to form fusible ferrous silicate which is removed as slag. 2 FeS +3 O ₂ 2 FeO +2 SO ₂

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