Which of the following oxoacids of sulphur contains "S" in two different oxidation states?

Question

Canvas Classes · Accepted Answer

Oxidation states of S in each acid:

| Acid | OS of S |
|---|---|
|  (thiosulphuric acid) | One S is +5, one S is −1 → two different OS ✓ |
|  (dithionic acid) | Both S are +5 (same) |
|  (pyrosulphuric acid) | Both S are +6 (same) |
|  (peroxodisulphuric acid) | Both S are +6 (same) |

(thiosulphate): structure is  with one O replaced by S. The central S is +5 and the terminal S is −1.

Answer: Option (1) —

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