Which of the following reaction is possible at anode?
- $2 \mathrm{Cr}^{3+}+7 \mathrm{H}_2 \mathrm{O} \rightarrow \mathrm{Cr}_2 \mathrm{O}_7^{2-}+14 \mathrm{H}^{+}$
- $\mathrm{F}_2 \rightarrow 2 \mathrm{~F}^{-}$
- $(1 / 2) \mathrm{O}_2+2 \mathrm{H}^{+} \rightarrow \mathrm{H}_2 \mathrm{O}$
- none of these
Solution
Asked in: JEE Main 2002