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Dipole moments of NH3 and NF3: which is larger and why (lone-pair orbital dipole)

The same question, asked 2 times: 30 Jan 2024, 5 Apr 2024. Every wording below, oldest first.

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  1. Question 1

    30 Jan 2024

    135
    Given below are two statements: Statement-I: Since fluorine is more electronegative than nitrogen, the net dipole moment of NF3NF_{3} is greater than NH3NH_{3}. Statement-II: In NH3NH_{3}, the orbital dipole due to lone pair and the dipole moment of NHNH bonds are in opposite direction, but in NF3NF_{3} the orbital dipole due to lone pair and dipole moments of N-F bonds are in same direction. In the light of the above statements. Choose the most appropriate from the options given below.

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  2. Question 2

    5 Apr 2024

    125
    Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): NH3NH_{3} and NF3NF_{3} molecule have pyramidal shape with a lone pair of electrons on nitrogen atom. The resultant dipole moment of NH3NH_{3} is greater than that of NF3NF_{3}. Reason (R): In NH3NH_{3}, the orbital dipole due to lone pair is in the same direction as the resultant dipole moment of the N−HN - H bonds. FF is the most electronegative element. In the light of the above statements, choose the correct answer from the options given below:

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