Chemistry - Redox Reactions Question with Solution | TestHub

Electrons gained per mole in acid: (a) V +5 $\to$ +4: 1; (b) $\mathrm{C}{\mathrm{r}}_2{\mathrm{O}}_7^{2-}$ has 2 Cr each +6 $\to$ +3: 6; (c) Mn +7 $\to$ +4: 3; (d) Cl +1 $\to$ -1: 2. Maximum is 6 for dichromate. Hence (b).