# NEET Chemistry Thermodynamics Questions Solved

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

(1) $C\left(diamond\right)\text{\hspace{0.17em}}+2{H}_{2}\left(g\right)=C{H}_{4}\left(g\right)$

(2) $C\left(graphite\right)+2{H}_{2}\left(g\right)=C{H}_{4}\left(l\right)$

(3) $C\left(graphite\right)+2{H}_{2}\left(g\right)=C{H}_{4}\left(g\right)$

(4) $C\left(graphite\right)+4H=C{H}_{4}\left(g\right)$

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