Which of the following are peroxoacids of sulphur?
- A$H_2SO_5$ and $H_2S_2O_8$
- B$H_2SO_5$ and $H_2S_2O_7$
- C$H_2S_2O_7$ and $H_2S_2O_8$
- D$H_2S_2O_6$ and $H_2S_2O_7$
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