Answer
A
Work Step by Step
Since the enthalpy of fusion is proportional to the strength of the ionic interaction, the answer would be the one with the least electronegative cation and the most electronegative anion: NaCl.
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 12 The Solid State - 12-6 Phase Changes Involving Solids - Review & Check for Section 12-6 - Page 463: 1
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