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

Question

$C{r_2}O_7^{2 - } \to 2C{r^{3 + }}$

$MnO_4^ - \to M{n^{2 + }}$

$CrO_4^{2 - } \to C{r^{3 + }}$

${C_2}O_4^{2 - } \to 2C{O_2}$

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