# What is the oxidation state of S in H2S2O8

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What is the oxidation state of  S in H2S2O8

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H2S2O8 has sulphur in the +6 oxidation state, hydrogen in the +1 oxidation state, the two O's between the two S-atoms are in the -1 oxidation state and all other oxygens are in the -2 oxidation state.

Whenever there is peroxy linkage , sulphur is always in its highest oxdidation. state i.e. +6

so here, oxidation. state of sulphur is +6