Some Basic Concepts of Chemistry - Result Question 18
18. The number of moles of $KMnO _4$ that will be needed to react completely with one mole of ferrous oxalate in acidic medium is
(1997)
(a) $\frac{2}{5}$
(b) $\frac{3}{5}$
(c) $\frac{4}{5}$
(d) 1
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Answer:
Correct Answer: 18. (b)
Solution:
The balanced redox reaction is :
$\begin{aligned} & 3 \mathrm{MnO}_4^{-}+5 \mathrm{FeC}_2 \mathrm{O}_4+24 \mathrm{H}^{+} \longrightarrow 3 \mathrm{Mn}^{2+}+5 \mathrm{Fe}^{3+} \ &+ 10 \mathrm{CO}_2+12 \mathrm{H}_2 \mathrm{O} \end{aligned}$
$\because 5$ moles of $\mathrm{FeC}_2 \mathrm{O}_4$ require 3 moles of $\mathrm{KMnO}_4$
$\therefore 1$ mole of $\mathrm{FeC}_2 \mathrm{O}_4$ will require $\frac{3}{5}$ mole of $\mathrm{KMnO}_4$.
BETA
