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NEET Sample Paper NEET Sample Test Paper-8

  • question_answer
    The molecule of \[B{{F}_{3}}\] and \[N{{F}_{3}}\] both are covalent compounds but \[B{{F}_{3}}\] is non-polar and \[N{{F}_{3}}\] is polar. The reason is that

    A)  boron is a metal and nitrogen is a gas in uncombined state

    B)  \[B{{F}_{3}}\] bonds have no dipole moment whereas \[N{{F}_{3}}\] bond have dipole moment.

    C)  Atomic size of boron is smaller than that of nitrogen

    D)  \[B{{F}_{3}}\] is symmetrical molecule whereas \[N{{F}_{3}}\] is unsymmetrical

    Correct Answer: D

    Solution :

    \[B{{F}_{3}}\] is symmetrical planar molecule, although it has polar bonds but resultant dipole moment is zero. In \[N{{F}_{3}}\] lone pair cause distortion hence it is unsymmetrical and polar molecule.


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