Chemical Bonding And Molecular Structure Question 475

Question: Which one of the following arrangements of molecules is correct on the basis of their dipole moments-

Options:

A) BF3>NH3>NF3

B) BF3>NF3>NH3

C) NH3>BF3>NF3

D) NH3>NF3>BF3

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Answer:

Correct Answer: D

Solution:

  • Both NF3 and NH3 have identical shape and a lone pair of electrons on nitrogen. The dipole moment of NH3 is higher than NF3 due to different directions of moments of the N - F and N - H bond. BF is a symmetrical molecule. It has zero dipole moment.


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