Answer
Sulfates have a higher melting point.
Work Step by Step
$SO_{4}^{2-}$ has a higher charge state and greater electrostatic attraction. Therefore its melting point will be far higher.
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 11 - Liquids and Intermolecular Forces - Exercises - Page 474: 11.31
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