MCQ
${O_3}$ reacts with $C{H_2} = C{H_2}$ to form ozonide. On hydrolysis it forms
- AEthylene oxide
- ✓$HCHO$
- CEthylene glycol
- DEthyl alcohol

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$C(s) + O_2(g) \to CO_2(g) + x\ kJ$
$CO(g) + \frac {1}{2}O_2(g) \to CO_2(g) + y\,kJ$
The heat of formation of $CO(g)$ is
