Which of the following equations is a balanced one ?

$\stackrel{+5}{\mathrm{Bi}}{\mathrm{O}}_3^{-} + {\mathrm{Mn}}^{+2} \to {\mathrm{Bi}}^{+3} +\stackrel{+7}{ \mathrm{Mn}}{\mathrm{O}}_4^{-}$

Change in oxidation state of ‘Bi’ = 2

Change in oxidation state of ‘Mn’ = 5

According to oxidation number method , (change in oxidation states are cross multiplied)

$5 {\mathrm{BiO}}_3^{-} + 2{\mathrm{Mn}}^{2+} \stackrel{ }{\to } 5{\mathrm{Bi}}^{3+} + 2{\mathrm{MnO}}_4^{-}$

Balance  H and O atoms

$5 {\mathrm{BiO}}_3^{-} + 14{\mathrm{H}}^{+} + 2{\mathrm{Mn}}^{2+} \stackrel{ }{\to } 5{\mathrm{Bi}}^{3+} + 7{\mathrm{H}}_2\mathrm{O} + 2{\mathrm{MnO}}_4^{-}$