Answer
$SeO_{3}$, Oxidation state of Se is +6.
Work Step by Step
Since net oxidation state of the compound is neutral, hence:
O: -2 X 3 = -6, then Se should have oxidation state of +6
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 22 - Chemistry of the Nonmetals - Exercises - Page 992: 22.44b
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