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Choose the correct oxidation number of sulphur in the compounds in column A from column B.

  Column A   Column B
 Na2SO4  -2
 H2SO3   +7
 H2S  +6
 H2S2O7  +4

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  Column A   Column B
 Na2SO4  +6
 H2SO3   +4
 H2S  -2
 H2S2O7  +7

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