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Given,`{:(E_(Fe^(3+) //Fe)^o + 3e Cr E^o =- 0.036 V),(E_(Fe^(3+) //Fe)^o =- 0.439 V):}` The value of standard electrode ptoential for the charge,A. 0.385 VB. 0.770 VC. `-0.270 V`D. `-0.072` |
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Answer» Correct Answer - B `Fe^(3+)+3e^(-)toFe" "triangleG_(1)=-3xxFxxF_(Fe^(3+)//Fe)^(0)` `Fe^(2+)toFe" "triangleG_(2)=-2xxFxxE_(Fe^(2+)//Fe)^(0)` `Fe^(3+)+e^(-)toFe^(2+)" "triangleG=triangleG_(1)-triangleG_(2)` `triangleG=3xx0.036F-2xx0.439xxF=-1xxE_((Fe^(3+)//Fe^(+2)))^(0)xxF` `E_((Fe^(3+)//Fe^(+2)))^(0)=2xx0.439-3xx0.036` `=0.878-0.108` `=0.770V` |
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