In acidic solution

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

Problem

In acidic solution, permanganate ion reacts with oxalate ion to yield Mn²⁺ and CO₂. Titration data show that 0.0200 mol of MnO₄⁻ reacts completely with 0.0500 mol of C₂O₄²⁻. Which of the following balanced equations (acidic medium) is most strongly supported by these mole ratios? (a) MnO4−+2 C2O42−+8 H+→Mn2++4 CO2+4 H2O\mathrm{MnO_4^-}+2\,\mathrm{C_2O_4^{2-}}+8\,\mathrm{H^+}\rightarrow\mathrm{Mn^{2+}}+4\,\mathrm{CO_2}+4\,\mathrm{H_2O} (b) 2 MnO4−+3 C2O42−+12 H+→2 Mn2++6 CO2+6 H2O2\,\mathrm{MnO_4^-}+3\,\mathrm{C_2O_4^{2-}}+12\,\mathrm{H^+}\rightarrow2\,\mathrm{Mn^{2+}}+6\,\mathrm{CO_2}+6\,\mathrm{H_2O} (c) 2 MnO4−+5 C2O42−+16 H+→2 Mn2++10 CO2+8 H2O2\,\mathrm{MnO_4^-}+5\,\mathrm{C_2O_4^{2-}}+16\,\mathrm{H^+}\rightarrow2\,\mathrm{Mn^{2+}}+10\,\mathrm{CO_2}+8\,\mathrm{H_2O} (d) 3 MnO4−+5 C2O42−+24 H+→3 Mn2++10 CO2+12 H2O3\,\mathrm{MnO_4^-}+5\,\mathrm{C_2O_4^{2-}}+24\,\mathrm{H^+}\rightarrow3\,\mathrm{Mn^{2+}}+10\,\mathrm{CO_2}+12\,\mathrm{H_2O}

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