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2. C
3. C
4. C
5. B
6. B
7. A
8.
9. a. 2Cl2 + O2 -> 2Cl2O
b. 2Fe+ O2 -> 2FeO
c. P4 + 6F2 -> 4PF3
d. 2N2 + 3O2 -> 2N2O3