Formula of caro's acid is

H_{2} S O_{5}

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H_{2} S_{2} O_{6}

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

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H_{2} S_{2} O_{8}

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Solution

The correct option is A $H_{2} S O_{5}$

$H_{2} S O_{5}$ : Caro's acid $\Rightarrow$

$H_{2} S_{2} O_{6}$ : Dithionic acid $\Rightarrow$

$H_{2} S_{2} O_{7}$ : Pyrosulphuric acid $\Rightarrow$

$H_{2} S_{2} O_{8}$ : Marshall's acid $\Rightarrow$

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