2. Solved Papers
  3. AFMC

AFMC AFMC Solved Paper-2001

  • question_answer
    Both \[B{{F}_{3}}\]and \[N{{F}_{3}}\]are covalent but \[B{{F}_{3}}\]molecule is non-polar while \[N{{F}_{3}}\] is polar because:

    A) atomic size of boron is smaller than nitrogen

    B) \[B{{F}_{3}}\]is planar but \[N{{F}_{3}}\]is pyramidal

    C) boron is a metal while nitrogen is a gas

    D) BF bond have no dipole moment while NF bond have dipole moment

    Correct Answer: B

    Solution :

    \[\text{B}{{\text{F}}_{\text{3}}}\]molecule has trigonal planar shape whereas \[\overset{\centerdot \centerdot }{\mathop{\text{N}{{\text{F}}_{\text{3}}}}}\,\] has pyramidal shape due to the presence of lone pair on nitrogen atom. The bond moment of N?F bond do not cancel, hence, it is polar, while B?F bonds cancel one another therefore, it is non polar.


You need to login to perform this action.
You will be redirected in 3 sec spinner