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sir in this question we have used equation G=nFE to get the E of resultant reaction but, sir in 2014 jee main (offline) their was same question and we have just added or subtracted the two reactions to get the E of the resultant. Sir please clear my doubt i have attached the image of question which came in AIEEE 2009 in which G=nFE is used ?
one year ago

Samyak Jain
333 Points

Actually, E$\degree$  is an intensive property while $\dpi{80} \Delta$G$\degree$ is an extensive property. This implies E$\degree$ cannot be just added
whereas $\dpi{80} \Delta$G$\degree$ can be added for reactions. However, the potentials are additive when half-reations are added to yield an overall reaction but they aren’t additive when half-reactions are added to give third half-reaction.
.$\degree$ = -nFE$\degree$G$\dpi{80} \Delta$In 2014 JEE Main (offline), the two half reactions were added to giveoverall reaction (in which no electrons were present). So E$\dpi{80} \degree$ could be added.But here the two reactions yield third half reaction (in which electron is present) and thus we need to proceed through
one year ago
Samyak Jain
333 Points

Actually, E$\degree$  is an intensive property while $\dpi{80} \Delta$G$\degree$ is an extensive property. This implies E$\degree$ cannot be just added whereas $\dpi{80} \Delta$G$\degree$ can be added for reactions. However, the potentials are additive when half-reations are added to yield an overall reaction but they aren’t additive when half-reactions are added to give third half-reaction.
In 2014 JEE Main (offline), the two half reactions were added to giveoverall reaction (in which no electrons were present). So E$\dpi{80} \degree$ could be added. But here the two reactions yield third half reaction (in which electron is present) and thus we need to proceed through $\dpi{80} \Delta$G$\degree$ = -nFE$\degree$.
one year ago
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### Course Features

• 731 Video Lectures
• Revision Notes
• Test paper with Video Solution
• Mind Map
• Study Planner
• NCERT Solutions
• Discussion Forum
• Previous Year Exam Questions