Which reactant is reducing agent in the reaction ? \[ \mathrm{Cu}^{2+}(\mathrm{aq})+\mathrm{H}_{...

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Which reactant is reducing agent in the reaction ?
\[
\mathrm{Cu}^{2+}(\mathrm{aq})+\mathrm{H}_{2}(g) \longrightarrow \mathrm{Cu}(s)+2 \mathrm{H}^{+}(\mathrm{aq})
\]
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