Redox Reactions And Electrochemistry Ques 225

Question: The EM3+/M2+0 values for Cr, Mn, Fe and Co are 0.41, +1.57, +0.77 and +1.97 V respectively. For which one of these metals the change in oxidation state from +2 to +3 is easiest [AIEEE 2004]

Options:

A) Fe

B) Mn

C) Cr

D) Co

Show Answer

Answer:

Correct Answer: C

Solution:

Reduction E0M3+/M2+ Cell reaction E0M2+/M3+ (Oxidation)

  • .41 V Cr2+ Cr3+ + . 41 V
  • 1.57 V Mn2+ Mn3+ - 1.57 V
  • 0.77 V Fe2+ Fe3+ - 0.77 V
  • 1.97 V Co2+ Co3+ - 1.97 V As Cr has maximum oxidation potential value, therefore its oxidation should be easiest.


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