Au³⁺ metal ion is reduced in the Au/Cr cell and Co²⁺ metal ion is reduced in the Co/Zr cell
A voltaic cell is a cell that generates electricity by a spontaneous redox reaction.
It is an electrochemical cell, also known as a galvanic cell and
Electrical energy is created by converting chemical energy.
Examples of voltaic cells include the dry cell, nickel-cadmium cell, lead storage cell, and fuel cells.
The half-cell reactions for each cell are given by
[tex]Au^{3+}(aq) + 3e^- \rightarrow Au(s)[/tex] ; E° = 1.50 V
[tex]Cr^{3+}(aq) + 3e^- \rightarrow Cr(s)[/tex] ; E° = –0.74 V
[tex]Co^{2+}(aq) + 2e^- \rightarrow Co(s)[/tex] ; E° = –0.28 V
[tex]Zn^{2+}(aq) + 2e^- \rightarrow Zn(s)[/tex] E° = –0.76 V
Thus, Au³⁺ is reduced in the Au/Cr cell and Co²⁺ is reduced in the Co/Zr cell
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