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Per NCERT §4.3.6, why is dipole moment of NH₃ (1.47 D) MUCH GREATER than that of NF₃ (0.23 D) despite F being more EN than N?
AIn NH₃ the N-lone-pair dipole AIDS the resultant N-H bond dipoles; in NF₃ it OPPOSES the N-F bond dipoles
BNF₃ is non-polar
CNH₃ is ionic
DF is less EN than H
Answer & Solution
Correct answer: A. In NH₃ the N-lone-pair dipole AIDS the resultant N-H bond dipoles; in NF₃ it OPPOSES the N-F bond dipoles
Per NCERT §4.3.6, lp on N points in same direction as resultant N-H dipoles in NH₃ (additive). In NF₃, lp opposes N-F resultant (subtractive). Hence NH₃ μ ≫ NF₃ μ.
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