Question

Which of the following statements is true for an electrochemical cell?

• A. $H_2$ is anode and $Cu$ is cathode
• B. $H_2$ is cathode and $Cu$ is anode
• C. Reduction occurs at $H_2$ electrode
• D. Oxidation occurs at $Cu$ electrode

Answer 1

Answer: (A)

As $Cu$ is below hydrogen in the electrochemical series. Hydrogen is oxidised at anode and comes out as $H_{2}$, while $Cu$ is reduced at the cathode
$2H^{+}+2e^{-} \to H_{2}$, $E^{\circ}=0.0\,V$
$Cu^{2+}+2e^{-} \to Cu$, $E^{\circ}=0.337\,V$