Answer
decreased
Work Step by Step
When a substance is reduced, we know that its oxidation number has decreased. Thus "decrease" is the correct answer.
Chemistry: The Molecular Science (5th Edition)
by Moore, John W.; Stanitski, Conrad L.
Published by
Cengage Learning
ISBN 10:
1285199049
ISBN 13:
978-1-28519-904-7
Chapter 3 - Chemical Reactions - Questions for Review and Thought - Review Questions - Page 148a: 3d
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