Which of the following is true in case of titration of Mohr's salt with $\mathrm{KMnO}_{4}$ ?\

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Professor PC Thomas Classes · Answer

(d) : According to molarity equation $$ n_{1} 	imes M_{1} 	imes V_{1}=n_{2} 	imes M_{2} 	imes V_{2} $$ where, $n=$ change in oxidation number or valency factor $\mathrm{KMnO}_{4}$ reacts with Mohr's salt as :\ $\mathrm{MnO}_{4}{ }^{-}+8 \mathrm{H}^{+}+5 \mathrm{Fe}^{2+} ightarrow 5 \mathrm{Fe}^{3+}+\mathrm{Mn}^{2+}+4 \mathrm{H}_{2} \mathrm{O}$\ $n_{\mathrm{KMnO}_{4}}=5, n_{	ext {Mohr's salt }}=1$\ Hence, $5 	imes M_{\mathrm{KMnO}_{4}} 	imes V_{\mathrm{KMnO}_{4}}=M_{	ext {Mohr's salt }} 	imes V_{	ext {Mohr's salt }}$\