Which of the following is also referred to as ‘Marshall’s acid’?

H O_{3} S O O S O_{3} H

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H O_{3} S O S O_{3} H

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H O_{3} S S O_{3} H

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H O_{3} S S O_{2} H

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Solution

The correct option is A $H O_{3} S O O S O_{3} H$
Marshall’s acid is the common name for peroxy-disulphuric acid $(H_{2} S_{2} O_{8})$ .

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