| $1. \text{सल्फ्यूरस एसिड}$ | $p. H_{3}PO_{4}$ |
| $2. \text{सल्फ्यूरिक एसिड}$ | $q. H_{2}S_{2}O_{7}$ |
| $3. \text{ओलियम}$ | $r. H_{2}SO_{3}$ |
| $4. \text{फॉस्फोरिक एसिड}$ | $s. H_{2}SO_{4}$ |
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