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MnO(4)^(-)+8H^(+)+5e to Mn^(2+)+4H(2)O" ...

`MnO_(4)^(-)+8H^(+)+5e to Mn^(2+)+4H_(2)O" "E^(0)=+1.51V`
`Fe^(3+)+e to Fe^(2+)" "E^(0)=+0.77V`
`Cl_(2)+2e to 2Cl^(-) " "E^(0)=+1.36V`
`Ce^(4+)+e to Ce^(3+) " "E^(0)=1.76`
Choose the incorrect statement among the following:

A

`MnO_(4)^(+)` is a sufficlently strong oxidant In acidic solution (pH =0) to oxidize `Fe^(2+)` ion.

B

`Fe^(2+)` ion cannot be titrated against standard `KMnO_4` solution if the, medium is made acidic (pH =0) by adding HCl.

C

`MnO_(4)^(-),` ion cannot oxidize Cet in acidic medium (pH =0)

D

`Fe^(2+)` cannot be titrated against standard `KMnO_4` solution in acid medium (pH =0) in presence of `Ce^(3+)` ion.

Text Solution

Verified by Experts

The correct Answer is:
D
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MnO_(4)^(-) + 8H^(+) + 5e^(-) rightarrow Mn^(2+) + 4H_(2)O , E^(@) = 1.51V MnO_(2) + 4H^(+) + 2e^(-) righarrow Mn^(2+) + 2H_(2)O E^(@) = 1.23V E_(MnO_(4)^(-)|MnO_(2)

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 incorrect statement regarding quantitative estimation of aqueous Fe(NO_(3))_(2)

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