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| List I (Oxidation number) | List II (The element) |
|---|---|
| A. 2 | 1. Oxidation number of Mn in MnO₂ |
| B. 3 | 2. Oxidation number of S in H₂S₂O₇ |
| C. 4 | 3. Oxidation number of Ca in CaO₂ |
| D. 6 | 4. Oxidation number of Al in NaAlH₄ |