MCQ
Resonance structures can be written for
- ✓$O_3$
- B$NH_3$
- C$CH_4$
- D$H_2O$

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$CO + \frac{1}{2}{O_2} \to C{O_2};\,\Delta H = - 24\,kJ$ The heat of formation of $C{O_2}$ is .....$kJ$