Which of the following changes involves transfer of 5 electrons?

1. $\mathrm{MnO}_4^{-} \longrightarrow \mathrm{Mn}^{2+}$
2. $\mathrm{CrO}_4^{2-} \longrightarrow \mathrm{Cr}^{3+}$
3. $\mathrm{NO}_3^{-} \longrightarrow \mathrm{NH}_4^{+}$
4. $\mathrm{Cr}_2 \mathrm{O}_7^{2-} \longrightarrow 2 \mathrm{Cr}^{3+}$

Asked in: MHT CET 2024 (09 May Shift 2)

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