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e.m.f. diagram for some ions is given as...

e.m.f. diagram for some ions is given as :
`FeO_(4)^(2-)overset(E^(@)=+2.20V)rarrFe^(3+)overset(E^(@)=+0.77V)rarrFe^(2+)overset(E^(@)=-0.445V)(rarr)Fe^(0)`
Datermine the value of `E_(FeO_(4)^(2-)//Fe^(2+))^(@)`.

A

1.84 V

B

1.42 V

C

1.3 V

D

2.0 V

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The correct Answer is:
A
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