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) $



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