The number of moles of MnO₄^- and Cr₂O₇^-2 separately required to oxidise one mole of FeC₂O₄ each in acidic medium respectively

$3{\mathrm{MnO}}_4^{-}+5{\mathrm{FeC}}_2{\mathrm{O}}_4+24{\mathrm{H}}^{+}⟶3{\mathrm{Mn}}^{+2}+5{\mathrm{Fe}}^{+3}+10{\mathrm{CO}}_2+12{\mathrm{H}}_2\mathrm{O}$

⟹5FeC₂​O₄​ reacts with $3{\mathrm{MnO}}_4^{-}$

⟹1 mole of FeC₂​O₄​=3/5​ mole of ${\mathrm{MnO}}_4^{-}$

∴1 mole of FeC₂​O₄​=0.6 mole of  ${\mathrm{MnO}}_4^{-}$

${\mathrm{Cr}}_2{\mathrm{O}}_7^{-2}+2{\mathrm{FeC}}_2{\mathrm{O}}_4+14{\mathrm{H}}^{+}⟶2{\mathrm{Cr}}^{+3}+2{\mathrm{Fe}}^{+3}+4{\mathrm{CO}}_2+7{\mathrm{H}}_2\mathrm{O}$

⟹2 mole of FeC₂​O_4​ required 1 mole of ${\mathrm{Cr}}_2{\mathrm{O}}_7^{-2}$

⟹1 mole of FeC2​O4​ required 1/2​ mole of  ${\mathrm{Cr}}_2{\mathrm{O}}_7^{-2}$

⟹0.5 mole of ${\mathrm{Cr}}_2{\mathrm{O}}_7^{-2}$