Chemical Thermodynamics · JEE Main previous year questions

2006 1 question

1. Q1062006 · 29 Apr 2006 · Shift 1

   The standard enthalpy of formation ${\Delta }_f{H}^o$ at $298\mathrm{K}$ for methane, $\mathrm{C}{\mathrm{H}}_4(\mathrm{g})$, is $-74.8\mathrm{kJ}\mathrm{mo}{\mathrm{l}}^{-1}$. The additional information required to determine the average energy for $\mathrm{C}-\mathrm{H}$ bond formation would be :

   1. A.the dissociation energy of ${\mathrm{H}}_2$ and enthalpy of sublimation of carbon
   2. B.latent heat of vapourization of methane
   3. C.the first four ionization energies of carbon and electron gain enthalpy of hydrogen
   4. D.the dissociation energy of hydrogen molecule, ${\mathrm{H}}_2$
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   Answer: A