For which one of the following equations is $ \Delta H_{\text{reaction}} $ equal to $ \Delta H_f^\circ $ for the product:

Question

Accepted Answer

$ \text{Xe}(g) + \frac{1}{2}\text{F}_2(g) \rightarrow \text{XeF}_2(g) $

Answer

$ \text{N}_2(g) + \text{O}_3(g) \rightarrow \text{N}_2\text{O}_3(g) $

Answer

$ \text{CH}_4(g) + 2\text{Cl}_2(g) \rightarrow \text{CH}_2\text{Cl}_2(l) + 2\text{HCl}(g) $

Answer

$ 2\text{CO}(g) + \text{O}_2(g) \rightarrow 2\text{CO}_2(g) $

AIPMT PRELIMS 2003 Chemistry Enthalpy of Formation MCQ Question