Match the entries in column - I (molecule) and column - II (oxidation state of oxygen) and select the correct answer.
| Column - I | Column - II |
| P. O2 | 1. Zero |
| Q. H2O2 | 2. - 1 |
| R. O2F2 | 3. + 1 |
| S. RbO3 | 4. + 1/3 |
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