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  4. In an oxidation-reduction reaction, MnO 4-ion is converted to Mn 2+. What is the number of equivalents of KMnO 4 (mol. wt. =158 ) present in 250 mL of 0.04 M KMnO 4 solution ?

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Q. In an oxidation-reduction reaction, $MnO _{4}^{-}$ion is converted to $Mn ^{2+}$. What is the number of equivalents of $KMnO _{4}$ (mol. wt. $=158$ ) present in $250\, mL$ of $0.04\, M\, KMnO _{4}$ solution ?

JIPMERJIPMER 2009Some Basic Concepts of Chemistry

Solution:

Change in oxidation number $=(+7)-(+2)=5$
$\therefore $ Normality of solution $=5 \times 0.04=0.20\, N$
Volume $=250\, mL$
$\therefore $ Number of equivalents of $KMnO _{4}$
$=0.20 \times \frac{250}{1000}=0.05$