Exams › NEET › Chemistry

In ammonia (NH3), the bond dipoles and the molecular dipole point in the same direction, but in nitrogen trifluoride (NF3), they point in opposite directions. This results in an increase in dipole moment for NH3 and a decrease for NF3. Why does this happen?

1. The vectors are oriented in the same direction.
2. The vectors are oriented in opposite directions.
3. The dipole moment is diminished.
4. None of these statements are correct.

Correct answer: The vectors are oriented in opposite directions.

Solution

In NH3, the bond dipoles and the lone pair dipole align in the same direction, increasing the net dipole moment. In NF3, the bond dipoles oppose the lone pair dipole, reducing the net dipole moment.

Related NEET Chemistry questions

• Which of the following have identical bond order? (I) \( \boldsymbol{C} \boldsymbol{N}^{-} \) (II) \( \boldsymbol{O}_{\mathbf{2}}^{-} \) \( (\|\|) N O^{+} \) \( (\mid V) C N^{+} \)
• What type of bond does \( M g \) form with \( C l ? \)
• Shape of \( C O_{2} \) is:
• The shape of \( s p^{3} d^{2} \) hybridized molecule with 2 lone pairs will be:
• The hybrid orbitals with \( 33.33 \% \) Scharacter are involved in the bonding of one of the crystalline allotropes of carbon. The allotrope is :
• In certain polar solvents \( \boldsymbol{P} \boldsymbol{C l}_{5} \) undergoes an ionisation reaction in which \( C l^{-} \) ion leaves one \( P C l_{5} \) molecule and attaches itself to another \( 2 P C l_{5} \rightleftharpoons P C l_{4}^{+}+P C l_{6}^{-} \) What are the changes in the geometrical shapes that occur in this ionisation?

⚔️ Practice NEET Chemistry free + battle 1v1 →