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NEET UG CHEMISTRY MCQ: THERMODYNAMICS

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Which of the following equations correctly represents the standard heat of formation (ΔHfo)(\Delta H_f^o)of methane?
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Correct option: C
C(graphite)+2H(g)→CH4(g)C\left( {graphite} \right)\mathrm{ } + 2\mathrm{H}\left( \mathrm{g} \right) \to \mathrm{C}{\mathrm{H}_4}\left( \mathrm{g} \right)
Option B (C(graphite)+2H2(g)→CH4(g)C(graphite) + 2H_2(g) \to CH_4(g)) is correct because the standard heat of formation uses elements in their standard states (graphite for carbon and diatomic hydrogen gas).

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