Question

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

• A. 3/5
• B. 2/5
• C. 4/5
• D. 1

Answer 1

The correct option is A 3/5

$3KMn{O}_4$ + $5Fe{C}_2{O}_4$ + $H^{+}$ $\to$ $5F{e}^{3+}$ + $10C{O}_2$ + $3M{n}^{2+}$ + $3K^{+}$ + $H_{2}O$,

If 3 moles of $KMn{O}_4$ react with 5 moles of $Fe{C}_2{O}_4$, then, with one mole of $Fe{C}_2{O}_4$, $\frac{3}{5}$ of $KMn{O}_4$ will react.