Which of the following minerals does not contain iron?

Haematite 2 3 Fe O → Magnetite 3 4 Fe O → Limonite 2 3 2 Fe O .3H O → Magnesite 3 MgCO → 62. In the extraction of copper from its sulphide ore, the metal is formed by reduction of Cu₂O with (a) FeS (b) CO (c) Cu₂S (d) SO₂ Sulphide ore in the extraction of copper is formed by the reduction of 2 Cu O with 2 Cu S . The sulphide ore is heated in presence of air until an oxide is formed and then the heating is carried out in absence of air which leads to the reaction of oxide with sulphide. 2 2 2 Cu O+Cu S 6Cu+SO → Therefore, the correct answer is option (c) 2 C