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Forum Question BankEnthalpy change for the reaction, 4H(g) 2H (g) …

MEDIUMMCQ SINGLENEET ChemistryPhysical ChemistryThermodynamics and ThermochemistryPrevious Year Questions

Enthalpy change for the reaction, 4H(g) 2H (g) → is – 869.6 kJ. The dissociation energy of H–H bond is (CBSE AIPMT 2011)

A.+217.4 kJ

B.– 434.8 kJ

C.–869.6 kJ

D.+434.8 kJ✓ Correct

Explanation

2 4H g 2H g ; 869.6kJ → 2 2 2H g 4H g ; 869.6kJ H g 2H g ; 869.6 / 2kJ 434.8kJ → →

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