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Giving examples, differentiate between ‘roasting' and 'calcination'. |
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Answer» Solution :Calcination : The CONVERSION of carbonates and hydrated ores into their respective oxides by HEATING in LIMITED supply of air below its melting point is called calcination. For EXAMPLE : `CaCO_3cdot MgCO_3 overset(Delta)(rarr) CaO + MGO + 2CO_2` `Fe_2O_3 cdot 3H_2O overset(Delta)(rarr) Fe_2O_3 + 3H_2O`. Roasting : The conversion of sulphide ores into oxide ores by heating an ore below its melting point in excess supply of air is called roasting `2ZnS + 3O_2 to 2ZnO + 2SO_2` `2PbS + 3O_2 to 2PbO + 2SO_2` . |
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