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Q 2549012813.     Which of the following reaction define `Delta H_f^o` ?

JEE 2003 Prelims
A

`C_text(dimond) + O_2 -> CO_2 (g)`

B

`1/2 H_2 (g) +1/2 F_2 (g) -> HF(g)`

C

`N_2(g) + 3 H_2(g) -> 2NH_3 (g)`

D

`CO(g) + 1/2 O_2 (g) -> CO_2 (g)`

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