Roasting is heating ore in presence of oxygen and change ore to oxide by this some volatile impurities like SO₂ are removed. 27. Process of heating ore in air to remove sulphur is: (a) Calcination (b) Roasting (c) Smelting (d) None The process in which sulphide ores are heated at a very high temperature with excess oxygen is known as roasting. This process is generally carried out for sulphide minerals. The sulphide is converted to an oxide and sulphur is released as sulphur dioxide. Therefore, the correct answer is option (b) roasting.
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