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Standard electrode potential data are useful for understanding the suitability of an oxidant in a redox titration. Some half cell reaction and their standard potentials are given below:
`MnO_(4)^(-)(aq) +8H^(+)(aq) +5e^(-) rarr Mn^(2+)(aq) +4H_(2)O(l) E^(@) = 1.51V`
`Cr_(2)O_(7)^(2-)(aq) +14H^(+) (aq) +6e^(-) rarr 2Cr^(3+)(aq) +7H_(2)O(l), E^(@) = 1.38V`
`Fe^(3+) (aq) +e^(-) rarr Fe^(2+) (aq), E^(@) = 0.77V`
`CI_(2)(g) +2e^(-) rarr 2CI^(-)(aq), E^(@) = 1.40V`
Identify the only correct statement regarding quantitative estimation of aqueous `Fe(NO_(3))_(2)`

A

`MnO_(4)^(-)` can be used in aqueous `HCl`

B

`Cr_(2)O_(7)^(2-)` can be used in aqueous `HCl`

C

`MnO_(4)^(-)` can be used in aqueous `H_(2)SO_(4)`

D

`Cr_(2)O_(7)^(2-)` can be used in aqueous `H_(2)SO_(4)`.

Text Solution

Verified by Experts

The correct Answer is:
A
`MnO_(4)^(-)` ion can oxidise both `Fe^(2+)` to `Fe^(3+)` as well as `Cl^(-)` to `Cl_(2)`. So `Fe(NO_(3))_(2)` cannot be estimated quantitatively with `MnO_(4)^(-)` ion in HCl.
`E_(cell)^(@)` for the cell Pt, `Cl_(2)(g)(1atm)|Cl^(-)(aq)||MnO_(4)^(-)(aq)|Mn^(2+)(aq)`. is equal to `(1.51-1.4)=0.11V`
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Knowledge Check

  • Standard electrode potential data are useful for understanding the suitability of an oxidant in a redox titration. Some half-cell reactions and their standard potentials are given below: MnO_(4)^(-) (aq) +8H^(+) (aq)+5e^(-) to Mn^(2+) (aq)+4H_(2)O(l) E^(@)=1.51V Cr_(2)O_(7)^(2-) (aq) +14H^(+) (aq) +6e^(-) to 2Cr^(3) (aq)+7H_(2)O(l) E^(@)=1.38V Fe^(3+) (aq) +e^(-) to Fe^(2+) (aq) E^@=0.77V Cl_(2)(g)+2e^(-) to 2Cl^(-) (aq) E^(@)=1.40V Identify the only incorrect statement regarding the estimation of aqueous Fe(NO_3)_2 .

    A
    `MnO_(4)^(-)` can be used in aqueous HCI
    B
    `Cr_2O_(7)^(2-)` can be used in aqueous HCI
    C
    `Mn_4^(-)` can be used in aqueous `H_2SO_4`
    D
    `Cr_2O_(7)^(2-)` can be used in aqueous `H_2SO_4`

  • Standard electrode potential data are useful for understanding the suitability of an oxidant in a redox titration. Some half cell reaction and their standard potentials are given below MnO_(4)^(-)(aq)+8H^(+)(aq)+5e^(-)toMn^(2+)(aq)+4H_(2)O(l)" "E^(@)=1.51V Cr_(2)O_(7)^(2-)(aq)+14H^(+)(aq)+6e^(-)to2Cr^(3+)(aq)+7H_(2)O(l)" "E^(@)=1.38V Fe^(3+)(aq)+e^(-)toFe^(2+)(aq)" "E^(@)=0.77V Cl_(2)(g)+2e^(-)to2Cl^(-)(aq)" "E^(@)=1.40V Identify the only incorrect statement regarding the quantitative estimation of aqueous Fe(NO_(3))_(2)

    A
    `MnO_(4)^(-)` can be used in aqueous HCl
    B
    `Cr_(2)O_(7)^(2-)` can be used in aqueous HCl
    C
    `MnO_(4)^(-)` can be used in aqueous `H_(2)SO_(4)`
    D
    `Cr_(2)O_(7)^(2-)` can be used in aqueous `H_(2)SO_(4)`

  • Standard electrode potenital data are useful for understanding the suitablity of an oxidant in a redox titration. Some half cell reactions and their standard potential are given below: MnO_(4(aq))^(-) + 8H_((aq.))^(+) + 5e rarr Mn_((aq.))^(2+) + 4H_(2)O_(l),E^(@) = 1.51 V Cr_(2)O_(7(aq.))^(2-) + 14H_((aq.))^(+) + 6e rarr 2Cr_((aq.))^(3+) + 7H_(2)O_(l), E^(@) = 1.38 V Fe_(aq.)^(3+) 2e^(-) rarr Fe_((aq.))^(2), E^(@) = 0.77 V Cl_(2(g)) + 2e^(-) rarr 2Cl_((aq.))^(-), E^(@) = 1.40 V Identify the only incorrect statement regarding the quantitative estimation of aqueous Fe(NO_(3))_(2) :

    A
    `MnO_(4)^(-)` can be used in aqueous `HCl`
    B
    `Cr_(2)O_(7)^(2-)` can be used in aqueous `HCl`
    C
    `MnO_(4)^(-)` can be used in aqueous `H_(2)SO_(4)`
    D
    `Cr_(2)O_(7)^(2-)` can be used in aqueous `H_(2)SO_(4)`