Which of the following are peroxoacids of sulphur?
| 1. | \(\mathrm{H_{2} SO_{5} } \text{ and } \mathrm{H_{2} S_{2} O_{8}}\) | 2. | \(\mathrm{H_{2} SO_{5 }} \text{ and } \mathrm{H_{2} S_{2} O_{7}}\) |
| 3. | \(\mathrm{H_{2} S_{2} O_{7}} \text{ and } \mathrm{H_{2} S_{2} O_{8}}\) | 4. | \(\mathrm{H_{2} S_{2} O_{6}} \text{ and } \mathrm{H_{2} S_{2} O_{7}}\) |
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