In mildly alkaline medium, thiosulphate ion is oxidized by to form . The oxidation state of sulphur in is .

Question

In mildly alkaline medium, thiosulphate ion is oxidized by  to form . The oxidation state of sulphur in  is .

Canvas Classes · Accepted Answer

Step 1 — Identify the reaction:

In mildly alkaline medium,  oxidises  (thiosulphate) to  (sulphate):

Product  (sulphate ion)

Step 2 — Oxidation state of S in :

Step 3 — Verify the oxidation:
- S in :  (average)
- S in : 
- Change:  (oxidation, loss of 4e⁻ per S) ✓

Answer: 6

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