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Which of the following reaction is possible at anode ?
(1) \( 2 \mathrm{Cr}^{3+}+7 \mathrm{H}_{2} \mathrm{O} \rightarrow \mathrm{Cr}_{2} \mathrm{O}_{7}^{2-}+14 \mathrm{H}^{-} \)
(2) \( \mathrm{F}_{2} \rightarrow 2 \mathrm{~F}^{-} \)
P
(3) \( \frac{1}{2} \mathrm{O}_{2}+2 \mathrm{H}^{+} \rightarrow \mathrm{H}_{2} \mathrm{O} \)
W
(4) None of these
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