Question

1 mole of equimolar mixture of $F{e}_2(C_2{O}_4{)}_3$ and $Fe{C}_2{O}_4$ requires X moles of $KMn{O}_4$ in acidic medium for complete oxidation. The value of X is:

• A. 0.6
• B. 0.9
• C. 1.2
• D. 0.8

Answer 1

The correct option is B 0.9

$KMn{O}_4$ will oxidise $F{e}^{+2}$ to $F{e}^{+3}$ to $C{O}_2$.
$(3C_2^{3+}\to 6C^{4-}+6e^{-})$
$(C_2^{3+}\to 2C^{4-}+2e^{-})$
$F{e}^{2+}\to F{e}^{3+}+e^{-}$
Equation of $KMn{O}_4$ = equation of $Fe{C}_2{O}_4$ + equation of $F{e}_2(C_2{O}_4{)}_3$
$0.5\times 6+0.5\times 3=X\times \left(5\right)$
$X=0.9moles$