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JEE Advanced levelSingle correct optionDifficulty 3 of 3bn156

Caro's acid, $H X_{2} SO X_{5}$ , has the structure $HO - O - SO X_{2} - OH$ (one peroxo O-O link; H is $+ 1$ ). Which option gives the oxidation number of S and the number of O atoms with oxidation number $- 1$ ?

A $+ 6$ ; two
B $+ 8$ ; none
C $+ 6$ ; one
D $+ 4$ ; two

Answer: A

The peroxo O-O link contains two O atoms at

- 1

; the other three O are

- 2

.

2 (+ 1) + x + 2 (- 1) + 3 (- 2) = 0

gives

x = + 6

. Assuming all O

= - 2

would give an impossible

+ 8

.

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