Given below are two statements: Statement-I: Since fluorine is more electronegative than nitrogen, the net dipole moment of NF₃$NF_3$ is greater than NH₃$NH_3$. Statement-II: In NH₃$NH_3$, the orbital dipole due to lone pair and the dipole moment of NH bonds are in opposite direction, but in NF₃$NF_3$ 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.

Core Logic

Statement I: The net dipole moment of NH₃$NH_3$ (1.47 D$1.47\, D$) is actually greater than that of NF₃$NF_3$ (0.23 D$0.23\, D$). Therefore, Statement I is false.

Statement II: In NH₃$NH_3$, the N-H$N-H$ bond dipole moments (pointing towards the more electronegative N) reinforce the orbital dipole moment of the lone pair. In NF₃$NF_3$, the N-F$N-F$ bond dipole moments point away from N (towards the more electronegative F), opposing the orbital dipole moment of the lone pair. This partial cancellation in NF₃$NF_3$ makes its net dipole moment lower. Therefore, Statement II is also false, as it reverses the correct orientations.

Step 1: Final Conclusion

Since both statements assert the opposite of established facts regarding NH₃$NH_3$ and NF₃$NF_3$, both are false.

Chapter Mix

Class 11 Chemistry: Chemical Bonding and Molecular Structure