Which of the following acids exists in free form?

Which of the following acids exists in free form?

  1. A

    H2SO2

  2. B

    H2SO3

  3. C

    H2S2O3

  4. D

    H2S2O4

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    Solution:

    A sulphur oxoacid, thiosulfuric acid is a substance. Thiosulfuric acid has 2 sulphur atoms. The oxidation states of the two sulphur atoms are -2 and +6, respectively.
    H2SO2 cannot be found in its free form. H2S2O4 is created when it dimerizes.

    H2SO2H2S2O4

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