Answer
+7
Work Step by Step
KMnO4. Oxygen is -2 and there are 4 so 4*-2 = -8. K is an alkali metal so it is +1. The overall charge is 0 so the sum of the oxidation states is 0 and we have:
+1 +x -8 = 0
x = +7
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 4 - Reactions in Aqueous Solution - Exercises - Page 159: 4.49c
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