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What is average oxidation state state of...

What is average oxidation state state of sulphur in product formed in given reaction?
`Na_(2)SO_(3)+Na_(2)S+I_(2)to . . . .+NaI`

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Verified by Experts

The correct Answer is:
2
`Na_(2)SO_(3)+Na_(2)S+I_(2) to Na_(2)S_(2)O_(3)+2NaI`
Average oxidation state of S in `S_(2)O_(3)^(2-)=2`.
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