NH₃ and NF₃ are both pyramidal. Why does NH₃ have a much larger dipole moment than NF₃?
Correct answer D. In NH₃ the lone pair moment adds to the bond moments, while in NF₃ it opposes them
Explanation
In NH₃ the N–H bond dipoles point towards nitrogen, reinforcing the lone pair dipole. In NF₃ the N–F dipoles point away from nitrogen and partly cancel the lone pair.
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