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  4. The colour of KMnO4 solution is decolourised by Fe2+ solution, one mole of Fe2+ reacts with x moles of KMnO4. Find x.

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Q. The colour of $KMnO_4$ solution is decolourised by $Fe^{2+}$ solution, one mole of $Fe^{2+}$ reacts with $x$ moles of $KMnO_4$. Find $x$.

The d-and f-Block Elements

Solution:

$MnO^-_4 + 5Fe^{2+}+8H^+ \rightarrow 5Fe^{3+} + Mn^{2+} + 4H_2O$
In the above reaction $1$ mole of $MnO_4$ reacts with $5$ mole of $Fe^{2+}$.
or $1$ mole of $Fe^{2+}$ reacts with $0.2$ mole of $MnO_4^-$.