Which of the following involves transfer of five electrons ?

Which of the following involves transfer of five electrons ?
  1. $\mathrm{MnO}_{4}^{-} ightarrow \mathrm{Mn}^{2+}$
  2. $\mathrm{CrO}_{4}^{2-} ightarrow \mathrm{Cr}^{3+}$
  3. $\mathrm{MnO}_{4}^{2-} ightarrow \mathrm{MnO}_{2}$
  4. $\mathrm{Cr}_{2} \mathrm{O}_{7}^{2-} ightarrow 2 \mathrm{Cr}^{3+}$

Solution

O.N. of $\mathrm{Mn}$ in $\mathrm{MnO}_{4}^{-}$ is $+7$ and in $\mathrm{Mn}^{2+}$ it is $+2$ The difference is of 5 electrons /

Asked in: JEE-TOPICTESTS-CHEMISTRY

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