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JEE Advanced levelSingle correct optionDifficulty 3 of 3pn218

Sum the oxidation states of all sulphur atoms (use the average value per S atom where needed) in one molecule each of $H X_{2} S X_{2} O X_{8}$ (peroxo acid), $H X_{2} S X_{2} O X_{7}$ and $H X_{2} S X_{2} O X_{3}$ . The result is

A30
B26
C32
D28

Answer: D

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

: each S is

+ 6

because the peroxo oxygens are

- 1

, so the sum is 12.

H X_{2} S X_{2} O X_{7}

: each S is

+ 6

, sum 12.

H X_{2} S X_{2} O X_{3}

:

2 + 2 x - 6 = 0

gives sum

+ 4

. Total

= 12 + 12 + 4 = 28

.

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