MEDIUMMCQ SINGLEIChO (Chemistry Olympiad)Physical ChemistryThermodynamics and ThermochemistryPrevious Year Questions

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

A.–57.33 kJ mol–1

B.greater than –57.33 kJ mol–1

C.less than –57.33 kJ mol–1✓ Correct

D.57.33 kJ mol–1

Explanation

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.

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