Net cell reaction of a galvanic cell made of a metal electrode and the standard hydrogen electrode

1. A.
   $\ {Cu}_{(s)} + 2H_{(aq)}^{+} \longrightarrow {Cu}_{(aq)}^{+ 2} + H_{2(\text{ }g)}$
2. B.
   $\ H_{2(\text{ }g)} + {Cu}_{(aq)}^{+ 2} \longrightarrow 2H_{(aq)}^{+} + {Cu}_{(s)}$
3. C.
   ${Cu}_{(s)} + H_{2(\text{ }g)} \longrightarrow {Cu}_{(aq)}^{+ 2} + 2H_{(aq)}^{+}$
4. D.
   $\ {Cu}_{(aq)}^{+ 2} + 2H_{(aq)}^{+} \longrightarrow {Cu}_{(s)} + H_{2(\text{ }g)}$

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1. A.
   $\mathrm{H_{2(g)} + Cd^{2+}_{(aq)} \longrightarrow 2H^+_{(aq)} + Cd_{(s)}}$
2. B.
   $\mathrm{Cd_{(s)} + 2H^+_{(aq)} \longrightarrow Cd^{2+}_{(aq)} + H_{2(g)}}$
3. C.
   $\mathrm{2H_{2(g)} + Cd^{2+}_{(aq)} \longrightarrow 4H^+_{(aq)} + Cd_{(s)}}$
4. D.
   $\mathrm{2Cd_{(s)} + 2H^+_{(aq)} \longrightarrow 2Cd^{2+}_{(aq)} + H_{2(g)}}$

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