The enthalpy of neutralisation of \[N{{H}_{4}}OH\]and \[C{{H}_{3}}COOH\] is \[-10.5\text{ }kcal\text{ }mo{{l}^{-1}}\] and enthalpy of neutralisation of \[C{{H}_{3}}COOH\] with strong base is\[-12.5\,kcal\text{ }mo{{l}^{-1}}\]. The enthalpy of ionisation of \[N{{H}_{4}}OH\] will be

• A. \[3.2\text{ }kcal\text{ }mo{{l}^{-1}}\]
• B. \[2.0\text{ }kcal\text{ }mo{{l}^{-1}}\]
• C. \[3.0\text{ }kcal\text{ }mo{{l}^{-1}}\]
• D. \[4.0\text{ }kcal\text{ }mo{{l}^{-1}}\]