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_((aq))^- +8_((aq))^+ +5e to`
`Mn_((aq))^(2+)+4H_2O_((l)), E^0=1.51V`
`Cr_2O_(7(aq))^(2-)+14H_((aq))^+ +6e to`
`MnO_(4(aq))^-+8H_((aq))^+ +6e to`
`2Cr_((aq))^(3+)+7H_2O_((l)),E^0=1.38V`
`Fe_((aq))^(3+)+e^- toFe_((aq))^(2+),E^0=0.71V`
`Cl_2(g)+2e^- to 2C_((aq))^-, E^0=1.40V`
Identify the only incorrect statement regarding the quantitive estimation of aqueous `Fe(NO+3)_2`

Options

A. `MnO_4^-` can be used in aqueous HCl
B. `Cr_2O_7^(2-)` can be used in aqueous HCl
C. `MnO_4^-` can be used in aqueous `H_2SO_4`
D. `Cr_2O_7^(2-)` can be used in aqueous `H_2SO_4`

Explanation

(D) it is the case of attacked electrode that is
Anode: Cu `rarr Cu^(2+)`+2e,
Cathode : `Cu^(2+)` +2e `rarr` Cu
Thus no change in conc. Of `Cu^(2+)` ions.