If the following half cells have the E-o values asFe-3- - e- rightarrow Fe-2- E-o- -0-77V and -Fe-2-2 -e- longrightarrow -Fe- - E-o- -0-44 V The E-o of the half cell is Fe-3- - 3e- rightarrow Fe will be-0-33 V1-21 V0-04 V0-605 V

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If the following half cells have the Eo values asFe+3+e−→Fe+2; Eo=+0.77V and Fe+2+2e−⟶Fe ; Eo=−0.44V The Eo of the half cell is Fe+3+3e−→Fe will be:0.33 V1.21 V0.04 V0.605 V

If the following half cells have the $E^{o}$ values as
$F e^{+ 3} + e^{-} \to F e^{+ 2}$ ; $E^{o} = + 0.77 V$ and ${F e}^{+ 2} + 2 e^{-} ⟶ F e$ ; $E^{o} = - 0.44 V$ The $E^{o}$ of the half cell is $F e^{+ 3} + 3 e^{-} \to F e$ will be:
$0.33$ V
$1.21$ V
$0.04$ V
$0.605$ V