Chemistry

Problem

Which of the following equations is properly balanced for both atoms and net charge in acidic solution? a)

\mathrm{MnO_4^- + 8H^+ + 5Fe^{2+} \rightarrow Mn^{2+} + 2H_2O + 5Fe^{3+}}

\mathrm{MnO_4^- + 3SO_3^{2-} + 2H^+ \rightarrow Mn^{2+} + 3SO_4^{2-} + H_2O}

\mathrm{MnO_4^- + 8H^+ + 5Fe^{2+} \rightarrow Mn^{2+} + 4H_2O + 5Fe^{3+}}

\mathrm{Cr_2O_7^{2-} + 3Fe^{2+} + 14H^+ \rightarrow 2Cr^{3+} + 7H_2O + 3Fe^{3+}}