Answer
$+6$
Work Step by Step
O normally has an oxidation state of $-2$ and the molecule $CrO_{3}$ is neutral so the sum of the oxidation states of all atoms must be 0. This means the oxidation state of Cr must be $+6$ as $3(-2)+(+6)=0$
Chemistry: A Molecular Approach (3rd Edition)
by Tro, Nivaldo J.
Published by
Prentice Hall
ISBN 10:
0321809246
ISBN 13:
978-0-32180-924-7
Chapter 4 - Sections 4.1-4.9 - Exercises - Problems by Topic - Page 189: 93b
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