The rechargeable nickel-cadmium cell is used to power small appliances such as portable computers - VCE - SSCE Chemistry - Question 7 - 2005 - Paper 1
Question 7
The rechargeable nickel-cadmium cell is used to power small appliances such as portable computers. When the cell is being used, the electrode reactions are represent... show full transcript
Worked Solution & Example Answer:The rechargeable nickel-cadmium cell is used to power small appliances such as portable computers - VCE - SSCE Chemistry - Question 7 - 2005 - Paper 1
Step 1
I cadmium is deposited on the negative electrode
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Answer
During recharging, cadmium ions are reduced at the negative electrode (cathode), leading to the deposition of solid cadmium. Thus, this statement is true.
Step 2
II the pH of the electrolyte increases
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As cadmium is deposited and hydroxide ions are consumed, the pH of the electrolyte increases, making this statement true.
Step 3
III the direction of electron flow in the external circuit is from the anode to the cathode
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During the recharge process, electrons flow from the anode (positive electrode) to the cathode (negative electrode). Therefore, this statement is also true.
