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Grade 11IIT JEE Entrance Exam

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 ?

Question image for sir in this question we have used equation G=nFE

Sitanshu Yadav

7 Years agoGrade 11

2 Answers

Samyak Jain

7 Years ago

Actually, Eis an intensive property while $\Delta$ G is an extensive property. This implies E cannot be just added

whereas $\Delta$ G 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.

. = -nFEG $\Delta$ In 2014 JEE Main (offline), the two half reactions were added to giveoverall reaction (in which no electrons were present). So E could be added.But here the two reactions yield third half reaction (in which electron is present) and thus we need to proceed through

Samyak Jain

7 Years ago

Error occured while answering earlier. Here is the answer.

Actually, Eis an intensive property while $\Delta$ G is an extensive property. This implies E cannot be just added whereas $\Delta$ G 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 could be added. But here the two reactions yield third half reaction (in which electron is present) and thus we need to proceed through $\Delta$ G = -nFE.

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