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MCQMediumJEE Main 2026 · 21 January, Shift 2Enthalpies (Bond, Combustion, Formation…)

Chemistry Question from JEE Main 2026 · 21 January, Shift 2

Consider the following data : ΔfH⊖(methane,g)=−X  kJ mol−1\Delta_f H^\ominus (\text{methane}, g) = -X \; \text{kJ mol}^{-1}

Enthalpy of sublimation of graphite =Y  kJ mol−1= Y \; \text{kJ mol}^{-1}

Dissociation enthalpy of H2=Z  kJ mol−1H_2 = Z \; \text{kJ mol}^{-1}

The bond enthalpy of C−HC-H bond is given by :

  • A

    X+Y+4Z2\frac{X+Y+4Z}{2}

  • B

    X+Y+2Z4\frac{X+Y+2Z}{4}

  • C

    −X+Y+Z4\frac{-X+Y+Z}{4}

  • D

    X+Y+ZX+Y+Z

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