Which of the following reaction defines Delta H _(f)^(@) ?

1.	Which of the following reaction defines Delta H _(f)^(@) ?
Answer» `C_("diamond") + O_(2)(g) RARR CO_(2)(g)` `(1)/(2)H_(2)(g)+(1)/(2)F_(2)(g) rarr HF(g)` `N_(2)(g)+3H_(2)(g)rarr2NH_(3)(g)` `CO(g)+(1)/(2)O_(2)(g)rarr CO_(2)(g)` Answer :B

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