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Which of the following acids exists in free form?

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a
H2SO2
b
H2SO3
c
H2S2O3
d
H2S2O4

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detailed solution

Correct option is C

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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