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Q.

Which of the following acids exists in free form?

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a

$H_{2} S_{2} O_{4}$

b

$H_{2} S_{2} O_{3}$

c

$H_{2} S O_{2}$

d

$H_{2} S O_{3}$

answer is C.

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Detailed 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.

$H_{2} {SO}_{2} \to H_{2} S_{2} O_{4}$

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