Question

The number of moles of $KMnO_4$ that will be needed to react completely with one mole of ferrous oxalate in acidic medium is

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

Answer 1

Answer: (B)

$\frac{3}{5}$

Answer 2

The balanced redox reaction is :
$3MnO_4^-+5FeC_2O_4 +24H^+ \rightarrow \, 3Mn^{2+} + 5Fe^{3+}$
\hspace40mm +10CO_2+12H_2O
$\because \, \, 5 \, moles \, of \, FeC_2O_4 \, require \, 3 \, moles \, of \, KMnO_4$
$\therefore \, \, \, 1 \, mole of \, FeC_2O_4 \, will \, require \frac{3}{5} \, mole \, of \, KMnO_4$