Which of the following acids doesnot exist in the free form?

H_{2} S O_{2}

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

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H_{2} S O_{3}

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H_{2} S O_{4}

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Solution

The correct option is A $H_{2} S O_{2}$
$H_{2} S O_{2}$ doesnot exist in the free form. It dimerises to form $H_{2} S_{2} O_{4}$ .
$H_{2} S O_{2} \to H_{2} S_{2} O_{4}$

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