For the redox reaction
$M n O_{4}^{-} + C_{2} O_{4}^{- 2} + H^{+} \overset{}{\to} M n^{2 +} + C O_{2} + H_{2} O$
The correct coefficients of the reactants for the balanced equation are

$M n O_{4}^{-}$ $C_{2} O_{4}^{2 -}$ H⁺

16 5 2

MnO₄^- C₂O₄^2- H⁺

2 5 16

MnO₄^- C₂O₄^2- H⁺

5 16 2

MnO₄^- C₂O₄^2- H⁺

2 16 5

Solution

MnO₄^-	C₂O₄^2-	H⁺
2	5	16

$\overset{+ 7}{M n} O_{4}^{-} \overset{}{\to} \overset{+ 2}{M} n^{2 +}; 5 e^{-} g a i n . . . (i) {\overset{+ 3}{C}}_{2} O_{4}^{2 -} \overset{}{\to} \overset{+ 4}{C} O_{2}; 2 e^{-} l o s s . . . (i i) M u l t i p l y i n g (i) a n d 2 a n d (i i) b y 5 t o b a l a n c e e^{-} 2 M n O_{4}^{-} + 5 C_{2} O_{4}^{2 -} \overset{}{\to} 2 M n^{2 +} + 10 C O_{2} O n b a l a n c i n g c h a r g e; 2 M n O_{4}^{-} + 5 C_{2} O_{4}^{2 -} + 16 H^{+} \overset{}{\to} 2 M n^{2 +} + 10 C O_{2} + 8 H_{2} O$