Oxidation Number Of Sulphur

Chemistry Level 1

In which of the following compounds the oxidation number of sulphur is +7+7 ?

A. Na2S2O3Na_2S_2O_3

B. H2S2O7H_2S_2O_7

C. H2SO4H_2SO_4

D. None Of These\text{None Of These}

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