Which of the reaction defines \[\Delta H_{f}^{o}\] [IIT -JEE (Screenin

1.	Which of the reaction defines \[\Delta H_{f}^{o}\] [IIT -JEE (Screening) 2003]
A.	\[{{C}_{(\text{diamond})}}+{{O}_{2}}(g)\,\to \,C{{O}_{2}}(g)\]
B.	\[\frac{1}{2}{{H}_{2}}(g)+\frac{1}{2}{{F}_{2}}(g)\,\to \,HF(g)\]
C.	\[{{N}_{2}}(g)+3{{H}_{2}}(g)\,\to \,2N{{H}_{3}}(g)\]
D.	\[CO(g)+\frac{1}{2}{{O}_{2}}(g)\,\to \,C{{O}_{2}}(g)\]
Answer» C. \[{{N}_{2}}(g)+3{{H}_{2}}(g)\,\to \,2N{{H}_{3}}(g)\]

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Which of the reaction defines \[\Delta H_{f}^{o}\] [IIT -JEE (Screening) 2003]

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