Question

The number of moles of $KMn{O}_4$ that will be needed to react completely with one mole of ferrous oxalate in acidic solution is

• A. $\frac{3}{5}$
• B. $\frac{2}{5}$
• C. $\frac{4}{5}$
• D. $1$

Answer 1

The correct option is B $\frac{2}{5}$

$2Mn{O}_4^{-}+5C_2{O}_4^{2-}+16H^{+}\to 2M{n}^{2+}+8H_{2}O+10C{O}_2$
5 mole of $C_2{O}_4^{2-}$ react with 2 mole of $Mn{O}_4^{-}$
1 mole of $C_2{O}_4^{2-}$ react with $\frac{2}{5}$ mole of $Mn{O}_4^{-}$