Answer
$Au^{3+}$ and $Pt^{2+}$.
Work Step by Step
Co(s) can reduce substances on the left-hand side of half-reactions with E° value greater than -0.277 by itself undergoing oxidation. In this case, it can reduce $Au^{3+}$ and $Pt^{2+}$ ions.
Chemistry: The Molecular Science (5th Edition)
by Moore, John W.; Stanitski, Conrad L.
Published by
Cengage Learning
ISBN 10:
1285199049
ISBN 13:
978-1-28519-904-7
Chapter 17 - Electrochemistry and Its Applications - Questions for Review and Thought - Topical Questions - Page 782b: 32g
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