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Explain Aluminothermic process. |
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Answer» SOLUTION :Metallic OXIDES such as `Cr_(2)O_(3)` can be reduced by an aluminothermic process. Inthis process, the metal oxide is mixed with aluminium powder and placed in a fire clay crucible. To initiate the reduction process, an ignition mixture (USUALLY magnesium and barium peroxide)is used. `"BaO"_(2)+Mg to"BaO"+"MgO"` During the above reaction a large amount of heat is EVOLVED (temperature upto `2400^(@)C`, is generated and the reaction enthalpy is : `852" kJ mol"^(-1)`)which facilitates the reduction of `Cr_(2)O_(3)` by aluminium power. `"Cr"_(2)"O"_(3)+2Al overset(Delta)to2Cr+Al_(2)O_(3)` |
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