Answer
D.
Work Step by Step
$Al^{3+}$ is the most positively charged cation and the smallest one. Both of these properties increase the negative of the enthalpy of hydration, so the answer is $Al^{3+}$.
Chemistry and Chemical Reactivity (9th Edition)
by Kotz, John C.; Treichel, Paul M.; Townsend, John R.; Treichel, David A.
Published by
Cengage Learning
ISBN 10:
1133949649
ISBN 13:
978-1-13394-964-0
Chapter 11 Intermolecular Forces and Liquids - Study Questions - Page 435b: 34
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