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JEE Main & Advanced Chemistry Thermodynamics / रासायनिक उष्मागतिकी Question Bank Heat of reaction

  • question_answer
    The absolute enthalphy of neutralisation of the reaction \[MgO(s)+2HCl(aq)\to MgC{{l}_{2}}(aq)+{{H}_{2}}O(l)\]will be [CBSE PMT 2005]

    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 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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