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Given that bond energies of H- H and Cl- Cl are 430 ~kJ ~mol^-1 and 240 ~kJ mol^-1 respectively and Δ H_ f for HCl is - kJ mol^-1, bond enthalpy of…

NEET UG 2007 — Chemistry Physical Chemistry

2007mcqhard

Given that bond energies of H−H\mathrm{H}-\mathrm{H}H−H and Cl−Cl\mathrm{Cl}-\mathrm{Cl}Cl−Cl are 430 kJ mol−1430 \mathrm{~kJ} \mathrm{~mol}^{-1}430 kJ mol−1 and 240 kJ240 \mathrm{~kJ}240 kJ mol−1\mathrm{mol}^{-1}mol−1 respectively and ΔHf\Delta \mathrm{H}_{\mathrm{f}}ΔHf​ for HCl\mathrm{HCl}HCl is −kJ-\mathrm{kJ}−kJ mol−1\mathrm{mol}^{-1}mol−1, bond enthalpy of HCl\mathrm{HCl}HCl is:

Official previous-year question

Held on 30 Apr 2007 · Verified 9 Jul 2026.

Options

  1. A

    380 kJ mol−1380 \mathrm{~kJ} \mathrm{~mol}^{-1}380 kJ mol−1

  2. B

    425 kJ mol−1425 \mathrm{~kJ} \mathrm{~mol}^{-1}425 kJ mol−1

  3. C

    245 kJ mol−1245 \mathrm{~kJ} \mathrm{~mol}^{-1}245 kJ mol−1

  4. D

    290 kJ mol−1290 \mathrm{~kJ} \mathrm{~mol}^{-1}290 kJ mol−1

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