Answer
+3
Work Step by Step
H = +1, O = -2 x 2 = -4
Hence Cl will have an oxidation state of +3.
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 - Topical Questions - Page 148d: 49c
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