Heat evolved in the reaction H2+Cl2→ 2HCl is 182 kJ. Bond energies of H-H and Cl-Cl are 430 and 242 kJ/mol respectively. The H-Cl bond energy is

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245 kJ mol-1

427 kJ mol-1

366 kJ mol-1

154 kJ mol-1

answer is B.

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Detailed Solution

∆H=-2 × εH-Cl + εH-H +εCl-C ∴ - 182=-2 × a+430+242 ∴ a = 427 kJ mol-1

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