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WB JEE Medical WB JEE Medical Solved Paper-2014

  • question_answer
    The hydrides of the first elements in groups 15-17, namely\[N{{H}_{3}},{{H}_{2}}O\]and HF respectively show abnormally high values for melting and boiling points. This is due to

    A)  small size of N, O and F

    B)  the ability to form extensive intermolecular H-bonding

    C)  the ability to form extensive intramolecular H-bonding

    D)  effective van der Waals interaction

    Correct Answer: B

    Solution :

     Hydrides of N, 0 and F because of the small size and high electronegativity of elements, have ability to form extensive intermolecular (i.e., between two molecules) hydrogen bonding. Thus, a large amount of energy is required to break these bonds, i.e., the melting and boiling points of hydrides of these elements are abnormally high.


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