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In which of the following compounds the oxidation number of sulphur is +7+7+7 ?
A. Na2S2O3Na_2S_2O_3Na2S2O3
B. H2S2O7H_2S_2O_7H2S2O7
C. H2SO4H_2SO_4H2SO4
D. None Of These\text{None Of These}None Of These
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