MCQ
Find out the correct pair :
- ✓$\mathrm{OF}_2=-1 $
- B$ \mathrm{Cl}_4 \mathrm{O}_4=-1 $
- C$ \mathrm{I}_2 \mathrm{O}_4=-1 $
- D$ \mathrm{I}_2 \mathrm{O}_9=-1 $
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