1.

Which of the following equations correctly represents the standard heat of formation \[(\Delta H_{f}^{o})\] of methane [IIT JEE (Screening) 1992]

A.                 \[C(diamond)\,+2{{H}_{2}}(g)=C{{H}_{4}}(g)\]
B.                 \[C(graphite)+2{{H}_{2}}(g)=C{{H}_{4}}(l)\]
C.                 \[C(graphite)+2{{H}_{2}}(g)=C{{H}_{4}}(g)\]
D.                 \[C(graphite)+4H=C{{H}_{4}}(g)\]
Answer» D.                 \[C(graphite)+4H=C{{H}_{4}}(g)\]


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