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The absolute enthalpy of neutralisation of the reaction:

MgO(s) + 2HCl(aq) → MgCl2(aq) + H2O(l) will be

(a) -57.33 kJ mol-1

(b) greater than -57.33 kJ mol-1

(c) less than -57.33 kJ mol-1

(d) 57.33 kJ mol-1

1 Answer

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The correct option is : (c) less than -57.33 kJ mol-1


MgO is the oxide of weak base and we know that heat of neutralisation 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 neutralisation of weak base with strong acid will be less than - 57.33 kJ/mol.

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