NEET Chemistry Thermodynamics Questions Solved


Which of the following equations correctly represents the standard heat of formation (ΔHfo) of methane [IIT JEE (Screening) 1992]

(1) C(diamond)+2H2(g)=CH4(g)

(2) C(graphite)+2H2(g)=CH4(l)

(3) C(graphite)+2H2(g)=CH4(g)

(4) C(graphite)+4H=CH4(g)

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