Chemical Thermodynamics Question 173
Question: The absolute enthalphy of neutralisation of the reaction $ MgO(s)+2HCl(aq)\to MgCl_2(aq)+H_2O(l) $ will be [CBSE PMT 2005]
Options:
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}} $
Show Answer
Answer:
Correct Answer: A
Solution:
Heat of neutralisation will be less than $ -57.33\ kJ/mole $ because some amount of this energy will be required for the dissociation of weak base $ (MgO) $
