Electrode reaction or net reaction of a galvanic cell from electrode potentials

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

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1. A.
   $A_{(s)} + B_{(sq)}^{+ 2} \longrightarrow {\text{ }A}_{(sq)}^{+ 2} + B_{(s)}$
2. B.
   $A_{(s)} + 2{\text{ }B}_{(aq)}^{+} \longrightarrow A_{(aq)}^{+ 2} + 2{\text{ }B}_{(s)}$
3. C.
   $2{\text{ }A}_{(eq)}^{+ 2} + B_{(s)} \longrightarrow 2{\text{ }A}_{(s)} + B_{(aq)}^{+}$
4. D.
   $2{\text{ }A}_{(s)} + B_{(aq)}^{+} \longrightarrow 2{\text{ }A}_{(aq)}^{+ 2} + B_{(s)}$

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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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1. A.
   $\mathrm{Cu_{(s)} \longrightarrow Cu^{+2}_{(aq)} + 2e^-}$
2. B.
   $\mathrm{Cu^{+2}_{(aq)} + 2e^- \longrightarrow Cu_{(s)}}$
3. C.
   $\mathrm{H_2(g) \longrightarrow 2H^+_{(aq)} + 2e^-}$
4. D.
   $\mathrm{H^+_{(aq)} + 2e^- \longrightarrow H_2(g)}$

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