Answer
Cobalt has a lower $E^{\circ}_{red}$ value (-0.29V) as compared to that of Iron (-0.41V). Hence, it can not protect iron from corrosion, as the iron will be corroded first.
Work Step by Step
Given above
Chemistry: The Central Science (13th Edition)
by Brown, Theodore E.; LeMay, H. Eugene; Bursten, Bruce E.; Murphy, Catherine; Woodward, Patrick; Stoltzfus, Matthew E.
Published by
Prentice Hall
ISBN 10:
0321910419
ISBN 13:
978-0-32191-041-7
Chapter 20 - Electrochemistry - Exercises - Page 905: 20.86
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