Answer
$Mn_{2}O_{7}$
Work Step by Step
Mn is in highest oxidation state in $Mn_{2}O_{7}$, which implies that it is more acidic.
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 22 - Chemistry of the Nonmetals - Exercises - Page 992: 22.42a
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