Question

One mole of $Fe{C}_2{O}_4$ is oxidised by $KMn{O}_4$ in acidic medium. Number of moles of $KMn{O}_4$ used are :

• A. $0.6mol$
• B. $1.2mol$
• C. $0.4mol$
• D. $1mol$

Answer 1

The correct option is A $0.6mol$

$F{e}^{2+}$ as well $C_2{O}_4^{2-}$ is oxidised by $Mn{O}_4^{-}$ in acidic medium.
$Fe{C}_2{O}_4\rightleftharpoons F{e}^{2+}+C_2{O}_4^{2-}$
$5F{e}^{2+}+Mn{O}_4^{-}\to M{n}^{2+}+5F{e}^{3+}$
$5C_2{O}_4^{2-}+2Mn{O}_4^{-}\to M{n}^{2+}+10C{O}_2$
$5Fe{C}_2{O}_4\equiv 3Mn{O}_4^{-}$
$\therefore 1Fe{C}_2{O}_4\equiv \frac{3}{5}Mn{O}_4^{-}$$=0.6mol$