Introductory Chemistry (5th Edition)

Published by Pearson
ISBN 10: 032191029X
ISBN 13: 978-0-32191-029-5

Chapter 16 - Oxidation and Reduction - Exercises - Problems - Page 605: 82

Answer

Iron or $Fe$

Work Step by Step

The metal in the activity series that is oxidized with $Ni^{2+}$ ions but not $Cr^{3+}$ ions is Iron because it's in between Nickel and Chromium. $Fe$ is above $Ni$ so it can be oxidized with $Ni^{2+}$ but it's below $Cr^{3+}$ so it can't be oxidized with $Cr^{3+}$.
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