Chemistry (12th Edition)

Published by Prentice Hall
ISBN 10: 0132525763
ISBN 13: 978-0-13252-576-3

Chapter 20 - Oxidation-Reduction Reactions - Standardized Test Prep - Page 725: 4



Work Step by Step

(I) half reaction can be immediately eliminated, as Iron is increasing its oxidation number. (II) is a reduction because Chromium is decreasing its oxidation number from (6+) to (3+). (III) is also a reduction because Magnese is decreasing its oxidation number from (7+ ) to (2+ ) . Correct choice is (b).
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