KMnO4 is titrated with ferrous ammonium sulphate hexahydrate in presence of dilute H2SO4. Number of water molecules produced for 2 molecules of KMnO4 is _____.
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Solution
Sol. By balancing the redox reaction we get
$$
\begin{gathered}
10\left[\mathrm{FeSO}_4 \cdot\left(\mathrm{NH}_4\right)_2 \mathrm{SO}_4 \cdot 6 \mathrm{H}_2 \mathrm{O}\right]+2 \mathrm{KMnO}_4+8 \mathrm{H}_2 \mathrm{SO}_4 \\
\downarrow \\
5 \mathrm{Fe}_2\left(\mathrm{SO}_4\right)_3+2 \mathrm{MnSO}_4+10\left(\mathrm{NH}_4\right)_2 \mathrm{SO}_4+\mathrm{K}_2 \mathrm{SO}_4+68 \mathrm{H}_2 \mathrm{O}
\end{gathered}
$$
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