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JEE Main levelSingle correct optionDifficulty 2 of 3bn123

Which is the formula of sodium peroxodisulfate (the anion has two S atoms joined through a peroxo O-O link)?

A $Na X_{2} S X_{2} O X_{7}$
B $Na X_{2} S X_{2} O X_{3}$
C $Na X_{2} S X_{4} O X_{6}$
D $Na X_{2} S X_{2} O X_{8}$

Answer: D

Peroxodisulfate is

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

, i.e.

O X_{3} S - O - O - SO X_{3}

with two

- 2

charges balanced by two

Na X^{+}

.

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

is disulfate without the peroxo link.

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