JEE Main 2010 — Electrochemistry Question with Solution
From: AIEEE 2010
Question
The correct order of values with negative sign for the four successive elements Cr, Mn, Fe
and Co is :
Choose an option
Show full solutionCorrect option: A
Correct answer
AMn > Cr > Fe > Co
Step-by-step explanation
The value of for given metal ions are
and
and
So when we consider these values with a negative sign (i.e., taking the magnitude of the negative potentials), we get the values as :
- : 0.91 V
- : 1.18 V
- : 0.44 V
- : 0.28 V
Therefore, the correct order of values with the negative sign will be :
Mn > Cr > Fe > Co
This matches with option A.
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This is a previous-year question from JEE Main 2010, 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.