Inthemetallurgyofaluminium ........ . – InterviewSolution

1.	Inthemetallurgyofaluminium ........ .
Answer» ` Al^(3+) `isoxidised toAl (s) graphieanodeisoxidisedto carbonmonoxideandcarbondioxide oxidationstate ofoxygenchangesin thereactionatanode oxidationstate ofoxygenchanges intheoverallreactioninvolved in theprocess. Solution :Pleasenotethatoxidationstate ofO doesnotchangein either thereactionoccuringatthe anodeortheoverallreactionasshownbelow: Anode:`C +OVERSET ( 2-) Otooverset ( 2+) C +overset ( 2- ) O+2 e^- ,C +2 overset ( 2- )Otooverset ( 4 + ) C overset (2 - )(( O ) )_2` Overall REACTION :` "" overset ( +3 )(Al_2) overset (-2)O_3+3C to2 Al++3overset ( +2 )C overset (2 - ) O `. THUS,option(b) ISCORRECT.

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