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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3pt196

Which of the following oxidation state assignments is/are correct?

AO in $O X_{2} F X_{2}$ is $+ 1$
BCr in $CrO X_{5}$ (which has two peroxo groups) is $+ 6$
CAverage Fe in $Fe X_{3} O X_{4}$ is $+ 8/3$
DS in $H X_{2} S X_{2} O X_{8}$ (peroxodisulfuric acid) is $+ 7$

Answer: A, B, C

In

O X_{2} F X_{2}

,

2 x - 2 = 0

gives

+ 1

. In

CrO X_{5}

, with one oxide and two peroxide groups,

x - 2 - 4 = 0

gives

+ 6

. In

Fe X_{3} O X_{4}

,

3 x = 8

gives

+ 8/3

. In

H X_{2} S X_{2} O X_{8}

there are two peroxide oxygens, so

2 + 2 x + 6 (- 2) + 2 (- 1) = 0

gives

x = + 6

, not

+ 7

.

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