Which of the following molecular formula represents Marshall's acid?

1. $\mathrm{H}_{2} \mathrm{SO}_{5}$
2. $\mathrm{H}_{2} \mathrm{~S}_{2} \mathrm{O}_{7}$
3. $\mathrm{H}_{2} \mathrm{~S}_{2} \mathrm{O}_{6}$
4. $\mathrm{H}_{2} \mathrm{~S}_{2} \mathrm{O}_{8}$

Asked in: MHT CET 2020 (19 Oct Shift 2)

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