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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+))^(@)`.

Text Solution

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The correct Answer is:
1.84v
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Knowledge Check

  • E.M.F. diagram of some ions is given as FeO_(4)^(2-)overset(E^(@)=+2.20V)rarr Fe^(3+)overset(E^(@)=+0.77V)rarr Fe^(2+) overset(E^(@)=-0.445V)rarr Fe^(@) Determine 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

  • Given E_(Fe^(3+)//Fe)^(@)=-0.036V,E_(Fe^(2+)//Fe)^(@)=-0.439V . The value of E_(Fe^(3+)//Fe^(2+))^(@) will be

    A
    `-0.072V`
    B
    0.385V
    C
    0.770V
    D
    `-0.270V`

  • कुछ आयनों के लिए E.M.F. आरेख निम्न प्रकार दिया है- FeO_4^(2-) overset(E^2 = +2.20V)(rarr) Fe^(3+) overset(E^@ = +0.77V)(rarr)Fe^(2+)E_(FeO_4^(2-)//Fe^(2+))^@ के मान को निर्धारित कीजिए:

    A
    `1.84 V`
    B
    `1.42 V`
    C
    `1.3 V`
    D
    `2.0 V`