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What is the average oxidation state of S in Na2S6O6?

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in Chemistry – Class 11 by (148k points)
What is the average oxidation state of S in Na2S6O6?

(a) 5

(b) 0

(c) 5/2

(d) 2

This question was addressed to me in exam.

This intriguing question originated from Redox Reactions in section Redox Reactions of Chemistry – Class 11

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The correct answer is (c) 5/2

The explanation is: the average Oxidation state of elements in a compound is the average of the different oxidation States. The average oxidation state of S in Na2S6O6 is x. 2(1) + 4x + 6(-2) = 0; x = 5/2. The average Oxidation state of sulfur here is 5/2.

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