What is difference between roasting and calcinatio (5points)with examp

1.	What is difference between roasting and calcinatio (5points)with examples
Answer» Calcination:(i) Conversion of metals into their oxides at high temperature in absence of air (or) limited supply of air is called calcination.(ii) Carbonates, bicarbonate ores are subjected to calcination process.(iii)One is heated in the absence or limited supply of oxygen or air.(iv) Carbon dioxide is produced along with metal oxide.\xa0(v) Ex: ZnCO3 → ZnO + CO2Roasting:(i) Conversion of metals into their oxides in presence of air is called roasting.(ii) Sulphide ores are subjected to roasting process.(iii)One is heated in the presence of excess of oxygen or air.(iv) Sulphur dioxide is produced along with metal oxide.(v) Ex: 2ZnS + 3O2 → 2ZnO + 2SO2\xa0

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