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Thechoiceof areducingagentin aparticularcasedepends on thermodynamicfactor. How far do youagreewiththisstatement ?Supportyouropinionwithtwoexamples. |
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Answer» SOLUTION :Thermodynamic factorhelpsus in choosingasuitablereducingagentfor thereductionofaparticularmetaloxidetothemetallic stateasdiscussedbelow. It isevidentthatmetalsfor whichthestandardfreeenergyofformation`(DELTA _f G ^(@)) `oftheiroxidesislessnegative.Inotherwords,anymetalwillreducetheoxidesof other metalswhichlieaboveit in theEllinghamdiagrambecausethe STANDARD freeenergychange` (Delta _r G ^(@)) `ofthe combinedredox reactionwill be- vebyan amountequaltothedifferencein`Delta _f G^(@) `oftwometaloxides. Thus,both AlandZn can reduce FeOtoFebutFe cannotreduce`Al_ 2O_ 3 `toAl orZnOtoZn.Similarly, C canreduceZnOtoZn but notCO. |
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