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-The galvanic cell shown above uses the half-cells Pb²⁺/Pb and Zn²⁺/Zn,and a salt bridge containing KCl(aq).The voltmeter gives a positive voltage reading.The electrode B could be inert platinum metal or zinc.

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-The galvanic cell shown above uses the half-cells Pb²⁺/Pb and Zn²⁺/Zn,and a salt bridge containing KCl(aq).The voltmeter gives a positive voltage reading.The electrode B could be inert platinum metal or zinc.

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In a galvanic cell, the electrode B must be the one where reduction occurs. Since zinc is more reactive than lead, zinc will oxidize, and lead will reduce. Therefore, electrode B cannot be zinc; it must be inert platinum to facilitate the reduction of Pb²⁺ to Pb.

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