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Find out the oxidation number of suphur ...

Find out the oxidation number of suphur in the following species
`H_(2)SO_(4),S_(2)O_(4)^(2-),S_(2)O_(7)^(2-),HSO_(3)^(-) and HSO_(4)^(-)`

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O.N of S =+6 in `H_(2)SO_(4) and HSO_(4)^(-) "and" S_(2)O_(7)^(2-) +4 in HSO_(3)^(-) "and" +3 in S_(2)O_(4)^(2-)`
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