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JEE Main levelSingle correct optionDifficulty 2 of 3bn015

Chromium pentoxide, $CrO X_{5}$ , has two peroxo ( $O - O$ ) groups and one oxo O atom (peroxo O is $- 1$ , oxo O is $- 2$ ). What is the oxidation number of chromium?

A $+ 4$
B $+ 6$
C $+ 5$
D $+ 10$

Answer: B

Four peroxo O contribute

4 (- 1) = - 4

and the oxo O contributes

- 2

. So

x - 4 - 2 = 0

, giving

x = + 6

.

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