Question

In the electrochemical cell: $ {{H}_{2}}(g)1\,\text{atm}\text{. 1}{{\text{H}}^{+}}(1M)||C{{u}^{2+}}(1M)Cu(s) $ Which one of the following statements is true?

• A. $ {{\text{H}}_{\text{2}}} $ is cathode, Cu is anode
• B. Oxidation occurs at Cu electrode
• C. Reduction occurs at $ {{\text{H}}_{\text{2}}} $ electrode
• D. $ {{\text{H}}_{\text{2}}} $ is anode, Cu is cathode

Answer 1

Answer: (D)

In the electrochemical cell $ {{H}_{2}}|{{H}^{+}}|\,|C{{u}^{2+}}|Cu $ oxidation takes place at hydrogen electrode and reduction takes place at copper electrode. In electrochemical cell oxidation takes place at anode and reduction takes place at cathode. So, $ {{\text{H}}_{\text{2}}} $ electrode behaves as anode and copper electrode behaves as cathode.