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