Answer
In this reaction, Oxidation state of N changes from 0 to -3, it is reduced, while oxidation state of H changes from 0 to +1, hence it is oxidized.
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Given above
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 20 - Electrochemistry - Integrative Exercises - Page 907: 20.111a
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