JEE Main 2013ChemistryElectrochemistryMediumMCQ

JEE Main 2013Electrochemistry Question with Solution

JEE Main 2013 (07 Apr)

Question

Four successive members of the first row of transition elements are listed below with atomic numbers. Which one of them is expected to have the highest EM3+/M2+o value?

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Show full solutionCorrect option: B
Correct answer
BCo (Z = 27)

Step-by-step explanation

Species having the highest reduction potential i.e., tendency to undergo reduction by gain of electron. SRP value increases from left to right in the period for the d-block elements.
M 3+ (aq)+1 e M 2+ (aq)
26Fe3+/Fe2+4s03d54s03d6+0.77 volt27Co3+/Co2+4s03d64s03d7+1.97 volt24Cr3+/Cr2+4s03d34s03d4-0.4 volt25Mn3+/Mn2+4s03d44s03d5+1.57 volt

Highest reduction potential means strong oxidising agent, i.e. undergoing reduction Co3++1e-Co2+.

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About this question

This is a previous-year question from JEE Main 2013, 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.