Which of the following equations represents the oxidising action of sulphur dioxide?

  1. A

    2Fe3++SO2+2H2O2Fe2++SO42+4H+

  2. B

    3Fe+SO22FeO+FeS

  3. C

    2MnO4+2H2O+5SO22Mn2++4H++5SO42

  4. D

    Cr2O7+SO2+H2SO4K2SO4+Cr2SO43+H2O

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    Solution:

    3Fe+SO22FeO+FeS

    Here SO2 acts as an oxidising agent and thus oxidises Fe to S.

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