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JEE Main levelSingle correct optionDifficulty 2 of 3bn027

The ion $S X_{2} O X_{8} X^{2 -}$ contains one peroxo ( $O - O$ ) link and both S atoms are in the $+ 6$ state. What is its correct name?

Adithionate
Bthiosulfate
Cdisulfate (pyrosulfate)
Dperoxodisulfate

Answer: D

Replacing the oxo bridge of disulfate (

S X_{2} O X_{7} X^{2 -}

) by a peroxo bridge gives

S X_{2} O X_{8} X^{2 -}

, peroxodisulfate (persulfate in older usage). Check:

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

gives

x = + 6

.

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