The reaction in which dihydrogen is acting as an oxidising agent is

The reaction in which dihydrogen is acting as an oxidising agent is
  1. $\begin{aligned} & \mathrm{Pd}^{2+}{ }_{(a q)}+\mathrm{H}_{2(g)} \longrightarrow \mathrm{Pd}_{(s)}+2 \mathrm{H}_{(a q)}^{+}\end{aligned}$
  2. $\mathrm{CuO}_{(s)}+\mathrm{H}_{2(g)} \longrightarrow \mathrm{Cu}_{(s)}+\mathrm{H}_2 \mathrm{O}_{(g)}$
  3. $2 \mathrm{Na}_{(s)}+\mathrm{H}_{2(g)} \longrightarrow 2 \mathrm{NaH}_{(s)}$
  4. $\begin{aligned} & \mathrm{O}_{2_{(g)}}+2 \mathrm{H}_{2(g)} \longrightarrow 2 \mathrm{H}_2 \mathrm{O}_{(l)}\end{aligned}$

Solution

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Asked in: AP EAMCET 2017 (26 Apr Shift 2)

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