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Which of the following acids does not exist in the free form?

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H_{2} S O_{2}

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

H_{2} S_{2} O_{7}

H_{2} S O_{4}

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detailed solution

Correct option is A

$H_{2} S O_{2}$ cannot be found in its free form. $H_{2} S O_{4}$ is created when it dimerizes.

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

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