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Which statement is correct for sodium tetrathionate, Na2S4O6?

1. The mean oxidation state of sulfur atoms is +2.
2. Two sulfur atoms have oxidation number 0 each, while the other two have oxidation number +5 each.
3. Two sulfur atoms have oxidation number +1 each, while the other two have oxidation number +4 each.
4. None of the above.

Correct answer: Two sulfur atoms have oxidation number 0 each, while the other two have oxidation number +5 each.

Solution

In sodium tetrathionate, Na2S4O6, the structure includes two sulfur atoms in the zero oxidation state, which are part of a thiosulfate group, and two sulfur atoms that are in the +5 oxidation state, typically found in the sulfate group. This distribution of oxidation states accurately reflects the overall charge balance and molecular structure.

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