OnlineCBT
Chemistry · THERMODYNAMICS
हिन्दीConsider the following thermochemical statements regarding bond enthalpy and lattice enthalpy: (A) Mean bond enthalpy in polyatomic molecules is obtained by dividing total enthalpy of atomization by the number of bonds broken. (B) The lattice enthalpy is directly related to enthalpy of solution by \( \Delta_{\text{sol}}H^\ominus = \Delta_{\text{lattice}}H^\ominus + \Delta_{\text{hyd}}H^\ominus \). (C) Dissolution of an ionic compound is generally favored when its lattice enthalpy is very high compared to its hydration enthalpy. (D) For diatomic molecules, bond dissociation enthalpy is identical to enthalpy of atomization. Which of the above statements are correct?
Correct answer · Option 3
(A), (B) and (D) only
Explanation
(A), (B), and (D) are correct. (C) is incorrect because when lattice enthalpy is very high, dissolution does not take place readily (e.g., insoluble fluorides).
