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What is meant by aluminothermitc process ? |
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Answer» Solution :(i) Metallic oxides such as `Cr_(2)O_(3)` can be reduced by an aluminothermitc process. (ii) In this process, the metal oxide is mixed with aluminium powder and placed in a fire CLAY crucible. (iii) To INITIATE the reduction process, an ignition mixture (usually magnesium and barium peroxide) is used. `BaO_(2) + MG rarr BAO + MgO`. (iv) During the above reaction a large amount of heat is evolved (temperature up to `2400^(@)C` is generated and the reaction enthalpy is : `852 kJmol^(-1)`) which facilitates the reduction of `Cr_(2)O_(3)` by aluminium POWER. `Cr_(2)O_(3) + 2Al overset(Delta)rarr 2Cr + Al_(2)O_(3)` |
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