Standard electrode potential data are useful for understanding the suitability of an…

CHEMISTRY · Single correct · A Level · Chemistry · Oxidation, reduction and redox reactions · Oxidation, reduction and redox reactions

Problem

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 : MnO4−(aq.)+8H+(aq.)+5e−⟶Mn2+(aq.)+4H2O(l)\text{MnO}_4^- (\text{aq.}) + 8\text{H}^+ (\text{aq.}) + 5e^- \longrightarrow \text{Mn}^{2+} (\text{aq.}) + 4\text{H}_2\text{O} (\text{l}) ; E∘=1.51 VE^{\circ} = 1.51 \text{ V} Cr2O72−(aq.)+14H+(aq.)+6e−⟶2Cr3+(aq.)+7H2O(l)\text{Cr}_2\text{O}_7^{2-} (\text{aq.}) + 14\text{H}^+ (\text{aq.}) + 6e^- \longrightarrow 2\text{Cr}^{3+} (\text{aq.}) + 7\text{H}_2\text{O} (\text{l}) ; E∘=1.38 VE^{\circ} = 1.38 \text{ V} Fe3+(aq.)+e−⟶Fe2+(aq.)\text{Fe}^{3+} (\text{aq.}) + e^- \longrightarrow \text{Fe}^{2+} (\text{aq.}) ; E∘=0.77 VE^{\circ} = 0.77 \text{ V} Cl2(g)+2e−⟶2Cl−(aq.)\text{Cl}_2 (\text{g}) + 2e^- \longrightarrow 2\text{Cl}^- (\text{aq.}) ; E∘=1.40 VE^{\circ} = 1.40 \text{ V} Identify the only incorrect statement regarding the quantitative estimation of aqueous Fe(NO3)2\text{Fe}(\text{NO}_3)_2 . (1) MnO4−\text{MnO}_4^- can be used in aqueous HCl\text{HCl} (2) Cr2O72−\text{Cr}_2\text{O}_7^{2-} can be used in aqueous HCl\text{HCl} (3) MnO4−\text{MnO}_4^- can be used in aqueous H2SO4\text{H}_2\text{SO}_4 (4) Cr2O72−\text{Cr}_2\text{O}_7^{2-} can be used in aqueous H2SO4\text{H}_2\text{SO}_4

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