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Question

Consider the following half-cell reactions and associated standard half-cell potentials and determine the maximum voltage that can be obtained by combination resulting in spontaneous processes:
AuBr4(aq)+3eAu(s)+4Br(aq);E=0.86 V
Eu3+(aq)+eEu2+(aq);E=0.43 V
Sn2+(aq)+2eSn(s);E=0.14 V
IO(aq)+H2O(l)+2eI(aq)+2OH(aq);E=+0.49 V

A
+0.72
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B
+1.54
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C
+1.00
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D
+1.35
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Solution

The correct option is D +1.35
AuBr4(aq)+3eAu(s)+4Br(aq);E=0.86VAnodeIO(ar)+H2O(l)+2eI(aq)+2OH(aq);E=+0.49cathodeEcell=EcathodeEanode0.49(0.86)+1.35V

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