Voltaic cell can be recharged by______________?
Correct answer: B. by replacing external circuit with external source of electricity
- A. by addition of fresh solution
- B. by replacing external circuit with external source of electricity
- C. by removal of solution
- D. by heating it
Explanation
A rechargeable voltaic cell is restored by forcing the reverse redox reaction with an external source of electrical energy. The likely wrong choice is addition of fresh solution, which may replace reactants but does not reverse the electrode reactions or restore the cell's chemical energy.
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About Redox Reactions
Redox reactions involve oxidation and reduction occurring together, with electrons transferred between species or oxidation numbers changing. The topic covers assigning oxidation states, identifying oxidizing and reducing agents, balancing redox equations by oxidation number or half-reaction methods, and connecting chemical changes with galvanic and electrolytic cells.
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