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In which of the following equations, \( \mathrm{H}_{2} \mathrm{O}_{2} \) acts as a
P reducing agent in the acidic medium ?

U
(1) \( \mathrm{H}_{2} \mathrm{O}_{2}+2 \mathrm{H}^{+}+2 \mathrm{e}^{-} \longrightarrow 2 \mathrm{H}_{2} \mathrm{O} \)
(2) \( \mathrm{H}_{2} \mathrm{O}_{2}+2 \mathrm{OH}^{-} \longrightarrow 2 \mathrm{H}_{2} \mathrm{O}+\mathrm{O}_{2}+2 \mathrm{e}^{-} \)
(3) \( \mathrm{H}_{2} \mathrm{O}_{2} \longrightarrow 2 \mathrm{H}^{+}+\mathrm{O}_{2}+2 \mathrm{e}^{-} \)
(4) \( \mathrm{H}_{2} \mathrm{O}_{2}+\mathrm{OH}^{-}+2 \mathrm{e}^{-} \longrightarrow 3 \mathrm{OH}^{-} \)
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