General Chemistry 10th Edition

Published by Cengage Learning
ISBN 10: 1-28505-137-8
ISBN 13: 978-1-28505-137-6

Chapter 22 - The Transition Elements and coordination Compounds - Questions and Problems - Page 971: 22.33

Answer

Please see the work below.

Work Step by Step

We know that hexacyano means that there are six $CN^{-} $ligands boded to iron cation. HTe roman numeral II means that the oxidation state of the iron cation is +2, hence the overall charge of the complex ion is -4.
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