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JEE Advanced levelNumerical answerDifficulty 3 of 3bn086

Sodium peroxodisulfate has the peroxodisulfate ion $S X_{2} O X_{8} X^{2 -}$ , which contains one O-O linkage (those two O are $- 1$ , the other six O are $- 2$ ). Find the sum of the oxidation numbers of all sulfur atoms in one formula unit of the salt (nearest integer).

Numerical answer type, tolerance 0.5.

Answer: 12

Formula

Na X_{2} S X_{2} O X_{8}

. Charge balance:

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

, so

x = + 6

per S. Sum over the two S atoms

= 12

.

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