Answer
$Fe: +3$
Work Step by Step
The oxidation state of a monatomic ion is equal to its charge. The charge of Fe is $+3$ therefore its oxidation state is $+3$.
Chemistry: A Molecular Approach (3rd Edition)
by Tro, Nivaldo J.
Published by
Prentice Hall
ISBN 10:
0321809246
ISBN 13:
978-0-32180-924-7
Chapter 4 - Sections 4.1-4.9 - Exercises - Problems by Topic - Page 189: 92b
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