Answer
X$^-$ is the stronger base.
Work Step by Step
The conjugate base of a weak acid is a weak base. The conjugate base of a strong acid has negligible basicity. Since HX is the weaker acid, X$^-$ will be the stronger base.
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 16 - Acid-Base Equilibria - Exercises - Page 715: 16.2b
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