NEET Sample Paper NEET Sample Test Paper-19

  • question_answer \[{{H}_{2}}+C{{l}_{2}}\to 2HCl,\Delta H=-194\,kJ\]. In the above reaction the heat formation of HC1 is

    A)  +97 kJ                      

    B)  -97 kJ

    C)  +10 kJ                      

    D)  -10 kJ

    Correct Answer: B

    Solution :

    Heat of formation is the amount of heat absorbed or liberated when one mole of a substance is formed by its constituent element. When 2 moles of HCl is formed, the heat liberated =194 kJ. As when 1 mol of HC1 is formed the heat liberated \[=\frac{194}{2}=97\,kJ\] So, \[\Delta {{H}_{f}}=-97\,kJ.\] Hence, the correct option is [b].

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