Chemistry - Metallurgy Question with Solution | TestHub
Choose the correct option using the code regarding roasting process.
(I) It is the process of heating the ore in air to obtain the oxide.
(II) It is an exothermic process.
(III) It is used for the concentration of only sulphide ore.
(IV) It removes easily oxidisable volatile impurities present in the concentrated ore.
Options:
Answer:
Solution:
Statement I is correct because roasting involves heating concentrated ore in a regular supply of excess air to convert it into metal oxides.
Statement II is correct as the oxidation of sulfide ores during roasting releases a significant amount of heat, making it an exothermic reaction.
Statement III is incorrect because roasting is a chemical method used for converting ores into oxides, not a method for the physical concentration of ores.
Statement IV is correct since impurities like sulfur, arsenic, and phosphorus are oxidized into volatile gases (, ) and easily removed.
