Verified Solution • 2025–26 Session moderate

QAIPMT-2007-Ch-2323: NEET 2007 Chemistry - Class 11 AIPMT-2007-Ch-2323 Solution: Given that bond energies of H-H and Cl-Cl are \(430\ {kJ…

Given that bond energies of H-H and Cl-Cl are 430 kJ mol−1430\ \text{kJ mol}^{-1} and 240 kJ mol−1240\ \text{kJ mol}^{-1} respectively and ΔHf\Delta H_f for HCl is −90 kJ mol−1-90\ \text{kJ mol}^{-1}, bond enthalpy of HCl is

Multiple Choice Options

  • A 380 kJ mol−1380\ \text{kJ mol}^{-1}
  • B 425 kJ mol−1425\ \text{kJ mol}^{-1}
  • C 245 kJ mol−1245\ \text{kJ mol}^{-1}
  • D 290 kJ mol−1290\ \text{kJ mol}^{-1}

Step-by-Step Verified Solution

1 2 H 2 + 1 2 Cl 2 _ HCl _ H f = �90 kJ mol �1 _ _ H f = [ 1 2 (B.E) H 2 + 1 2 (B.E) Cl 2 ] - (B.E) HCl _ -90 = [ 1 2 (430) H 2 + 1 2 (240) Cl 2 ] - (B.E) HCl _ -90 = [215 + 120] - (B.E) HCl _ (B.E) HCl = 425 kJ mol �1

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