Chemical Bonding And Molecular Structure Question 436

Question: The molecules $ BF_3 $ and $ NF_3 $ are both covalent compounds, but $ BF_3 $ is non polar whereas $ NF_3 $ is polar. The reason for this is

Options:

A) atomic size of boron is larger than nitrogen

B) Boron is metal while nitrogen is gas

C) $ B-F $ bonds are non-polar while $ N-F $ bonds are polar

D) $ BF_3 $ is planar but $ NF_3 $ is pyramidal

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Answer:

Correct Answer: D

Solution:

  • The shape of $ BF_3 $ is trigonal planar and $ \mu =0 $ hence it is non polar. The shape of $ NF_3 $ is pyramidal and $ \mu \ne 0 $ hence it is polar.


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