The absolute enthalpy of neutralisation of the reaction: (g) (g) 2(aq) (l) MgO 2HCl MgCl H O → Will be (2005)

MgO is the oxide of weak base and we know that heat of neutralization of 1 eq. of strong acid with strong base is –57.33 kJ/mol. >>with weak base some heat is absorbed in dissociation of weak base. >>Heat of neutralization of weak base with strong acid will be less than –57.33 kJ/mol.