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The overall reaction in a chemical cell is shown below as the reaction takes place (look in image)

The overall reaction in a chemical cell is shown below as the reaction takes place-example-1
User Azalia
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According to provided equation it is clear that Zn metal is oxidized from Zn⁰ into Zn²⁺ which means that Zn metal dissolves and forming Zn²⁺ solution so the correct answer is:
mass of the Zn(s) electrode decreases

User SubniC
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