Chemistry (12th Edition)

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

Chapter 20 - Oxidation-Reduction Reactions - 20 Assessment: 41

Answer

+2 +3 +6 +7

Work Step by Step

The oxidation number of the metal atom is simply the ionic charge present on the Calcium metal, 2+, because it is a free ion. s has -2 charge so in order to balance the whole compound we should have the charge that is same as -6 but in positive, because charge of s is multiplied by coefficient 3. Na = +1CrO = +6 MnO4- Oxidation number = +7
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