JEE Main 2017 — Electrochemistry Question with Solution
From: JEE Main 2017 (Online) 8th April Morning Slot
Question
What is the standard reduction potential (Eo) for Fe3+ Fe ?
Given that :
Fe2+ + 2e Fe; = 0.47 V
Fe3+ + e Fe2+; = +0.77 V
Given that :
Fe2+ + 2e Fe; = 0.47 V
Fe3+ + e Fe2+; = +0.77 V
Choose an option
Show full solutionCorrect option: A
Correct answer
A 0.057 V
Step-by-step explanation
For the given reaction :
Fe3+ + e Fe2+; = +0.77 V
Go = -nFEo
= -0.77F
For the following reaction :
Fe2+ + 2e Fe; = 0.47 V
= 0.472F
Overall reaction :
Fe3+ + 3e Fe;
+ =
-0.77F + 0.472F =
= -0.057 V
Fe3+ + e Fe2+; = +0.77 V
Go = -nFEo
= -0.77F
For the following reaction :
Fe2+ + 2e Fe; = 0.47 V
= 0.472F
Overall reaction :
Fe3+ + 3e Fe;
+ =
-0.77F + 0.472F =
= -0.057 V
Practice this on the real CBT interface
Solve this JEE Main question (and the rest of the Electrochemistry chapter) on PrepSharp's TCS iON-style CBT player — with timer, bookmarks and session analytics.
Solve interactively →About this question
This is a previous-year question from JEE Main 2017, covering the Electrochemistry chapter of Chemistry. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.