A) less than \[-\,57.33\,kJ\,mo{{l}^{-1}}\]
B) \[-\,57.33\,kJ\,mo{{l}^{-1}}\]
C) greater than \[-\,57.33\,kJ\,mo{{l}^{-1}}\]
D) \[-\,57.33\,kJ\,mo{{l}^{-1}}\]
Correct Answer: A
Solution :
Heat of neutralisation of strong acid and strong base is \[-57.33\text{ }kJ\]. \[MgO\] is weak base while \[HCl\] is strong acid, so the heat of neutralisation of \[MgO\] and \[HCl\] is lower to \[-57.33\text{ }kJ\] because \[MgO\] requires some heat in ionisation, then net released amount of heat is decreased.
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