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When the cell is recharged, which one of the following processes occurs at the electrode connected to the positive terminal of the external power source? A - VCE - SSCE Chemistry - Question 16 - 2007 - Paper 1
Question 16
When the cell is recharged, which one of the following processes occurs at the electrode connected to the positive terminal of the external power source? A. reductio... show full transcript
Worked Solution & Example Answer:When the cell is recharged, which one of the following processes occurs at the electrode connected to the positive terminal of the external power source? A - VCE - SSCE Chemistry - Question 16 - 2007 - Paper 1
Step 1
oxidation of Ni(OH)2(s)
Answer
When a cell is recharged, the processes at the electrodes depend on whether it is operating as a galvanic or electrolytic cell. In this case, the electrode connected to the positive terminal of the external power source undergoes oxidation.
During the recharging process, the nickel hydroxide ( ext{Ni(OH)}_2) is oxidized at the positive electrode. This results in:
ightarrow ext{NiO}(s) + 2 ext{e}^- + ext{H}_2 ext{O}(l)$$ Thus, the correct answer is option C: oxidation of Ni(OH)2(s).