Which of the following oxyacids of sulphur contain four $\mathrm{S}=0$ bonds?
- $\mathrm{H}_{2} \mathrm{SO}_{5}$
- $\mathrm{H}_{2} \mathrm{SO}_{4}$
- $\mathrm{H}_{2} \mathrm{~S}_{2} \mathrm{O}_{6}$
- $\mathrm{H}_{2} \mathrm{~S}_{2} \mathrm{O}_{4}$
Solution

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