Identify the process

Question:

Identify the process in which change in the oxidation state is five :

  1. $\mathrm{Cr}_{2} \mathrm{O}_{7}^{2-} \rightarrow 2 \mathrm{Cr}^{3+}$

  2. $\mathrm{MnO}_{4}^{-} \rightarrow \mathrm{Mn}^{2+}$

  3. $\mathrm{CrO}_{4}^{2-} \rightarrow \mathrm{Cr}^{3+}$

  4. $\mathrm{C}_{2} \mathrm{O}_{4}^{2-} \rightarrow 2 \mathrm{CO}_{2}$


Correct Option: , 2

Solution:

$\mathrm{MnO}_{4}^{-}+5 \mathrm{e} \rightarrow \mathrm{Mn}^{+2}$

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