Which of the following acids exists in free form?

# Which of the following acids exists in free form?

1. A

${H}_{2}S{O}_{2}$

2. B

${H}_{2}S{O}_{3}$

3. C

${H}_{2}{S}_{2}{O}_{3}$

4. D

${H}_{2}{S}_{2}{O}_{4}$

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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.
${H}_{2}S{O}_{2}$ cannot be found in its free form. ${H}_{2}{S}_{2}{O}_{4}$ is created when it dimerizes.

${\mathrm{H}}_{2}{\mathrm{SO}}_{2}\to {\mathrm{H}}_{2}{\mathrm{S}}_{2}{\mathrm{O}}_{4}$

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