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AP EAMCET201825 Apr 2018Morning ShiftChemistryElectrochemistryActual

For which one of the following elements, M 3 + ∣ M 2 + standard electrode potential is more positive?

Options

  1. AV
  2. BCr
  3. CMn
  4. DFe

Correct answer

C. Mn

Step-by-step solution

Element SEP ( M 3 + / M 2 + ) V V 3 + / V 2 + = - 0 . 26   V Cr Cr 3 + / Cr 2 + = - 0 . 4   V Mn Mn 3 + / Mn 2 + = 1 . 5   V Fe Fe 3 + / Fe 2 +   = 0 . 8   V Mn 3 + / Mn 2 + has large positive value and M 3 + is least stable as it can be easily reduced to Mn 2 + .

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