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Standard potential data are usefull for understanding the suitability of an oxident in a redox titration. Some half cell reactions and their standard potentials are given ahead;

Identify the only incorrect statement regarding the quantitative estimation of aqueous Fe(NO3)2:

(a) ${\mathrm{MnO}}_{4}^{-}$ can be used in aqueous HCl

(b) ${\mathrm{Cr}}_{2}{\mathrm{O}}_{7}^{2-}$can be used in aqueous HCl

(c) ${\mathrm{MnO}}_{4}^{-}$can be used in aqueous H2SO4

(d) ${\mathrm{Cr}}_{2}{\mathrm{O}}_{7}^{2-}$can be used in aqueous H2SO4