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Difference Between Fe3 and Fe 2

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Solution

Fe(II) and Fe(III) Like many elements, iron (chemical symbol Fe) can exist in more than one chemical form, or "oxidation state." The two most common forms for iron are Fe(II), in which the iron ion shares two of its electrons, and Fe(III), in which it shares three electrons.

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Q. Which of the following statements are correct for the given electrochemical cells?
(I)

F e | F e^{2 +} | | F e^{3 +} | F e

F e | F e^{2 +} | | F e^{3 +}, F e^{2 +} | P t

F e | F e^{3 +} | | F e^{3 +}, F e^{2 +} | P t

E_{F e^{2 +} / F e}^{\circ} = - 0.44 V and E_{F e^{3 +} / F e^{2 +}}^{\circ} = 0.77 V

E_{F e^{3 +} / F e}^{\circ}

E_{F e^{2 +} / F e}^{o} = - 0.44 V, E_{F e^{2 +} / F e^{3 +}}^{o} = - 0.77 V

F e^{2 +}, F e^{3 +}

F e

solid are kept together, then:

E_{F e 2 + | F e}^{o} = - 0.44 V; E_{F e^{2 +} | F e^{3 +}}^{o} = - 0.77 V

F e^{2 +}, F e^{3 +}

F e

solid are kept together, then:

E_{F e^{3 +} | F e}^{⊖}

E_{F e^{2 +} | F e}^{⊖}

- 0.36 V

- 0.439 V

, respectively, then the value of

E_{F e^{3 +} | F e^{2 +}}^{⊖}

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