Question

In a lead-acid cell, the reason for development of positive and negative charge on the electrodes is ____.

• A. external heating of both the electrodes
• B. external current supply to both the electrodes
• C. chemical reactions between the electrodes and electrolytes
• D. external current supply through the electrolyte

Answer 1

The correct option is C chemical reactions between the electrodes and electrolytes

In a lead-acid cell, the two electrodes, lead oxide ($Pb{O}_2$) and lead ($Pb$) are dipped inside the electrolytic liquid which acts as medium for the two electrodes. The two electrodes undergo chemical reaction with electrolyte to develop positive and negative charge on one another, respectively. The lead oxide ($Pb{O}_2$) electrode acts as positive electrode and the lead ($Pb$) electrode acts as negative electrode.