JEE Main & Advanced Chemistry States of Matter Question Bank Kinetic molecular theory of gases and Molecular collisions

  • question_answer Helium atom is two times heavier than a hydrogen molecule at 298 K, the average kinetic energy of helium is     [IIT 1982]

    A)                 Two times that of a hydrogen molecule

    B)                 Same as that of a hydrogen molecule

    C)                 Four times that of a hydrogen molecule

    D)                 Half that of a hydrogen molecule

    Correct Answer: B

    Solution :

               \[\frac{{{E}_{He}}}{{{E}_{{{H}_{2}}}}}=\sqrt{\frac{{{T}_{He}}}{{{T}_{{{H}_{2}}}}}}\] so energies will be same for                                 \[He\And {{H}_{2}}\]at same temperature.


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