Quiz- Dipole moment

Dipole Moment Quiz

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Test your knowledge on Dipole Moment for JEE and NEET.

1. What is the unit of dipole moment?

• Angstrom
• Tesla
• Debye
• Joule

2. Which of the following factors does not influence the dipole moment?

• Electronegativity difference
• Bond length
• Shape of the molecule
• The mass of the molecule

3. The dipole moment of a diatomic molecule is a measure of its:

• Kinetic energy
• Bond order
• Polarity
• Electronegativity

4. Which of the following molecules has a zero dipole moment?

• $NH_3$
• $H_2O$
• $CCl_4$
• $SO_2$

5. Which of the following compounds has the highest dipole moment?

• $CH_4$
• $H_2O$
• $BF_3$
• $CO_2$

6. What is the correct order of increasing dipole moment for the following molecules: $H_2O$, $NH_3$, $BF_3$, $CH_4$?

• $BF_3 < CH_4 < NH_3 < H_2O$
• $CH_4 < BF_3 < NH_3 < H_2O$
• $BF_3 < NH_3 < CH_4 < H_2O$
• $H_2O < NH_3 < BF_3 < CH_4$

7. Why does 1,4-dichlorobenzene have a zero dipole moment?

• Because it has a planar geometry.
• Because it has a tetrahedral geometry.
• Because the two $C-Cl$ bond dipoles are equal and point in opposite directions, cancelling each other out.
• Because it contains lone pairs of electrons.

8. The dipole moment of a molecule with a perfect tetrahedral geometry is always zero if:

• All bonded atoms are different.
• There are no lone pairs.
• The central atom is in a high oxidation state.
• All four atoms bonded to the central atom are identical.

9. Which of the following molecules has a non-zero dipole moment?

• $BCl_3$
• $SF_6$
• $BeCl_2$
• $PCl_3$

10. Which of the following compounds has the lowest dipole moment?

• Trans-1,2-dichloroethene
• Cis-1,2-dichloroethene
• Methyl chloride ($CH_3Cl$)
• Chlorobenzene

11. The dipole moment of $NH_3$ is higher than that of $NF_3$ even though fluorine is more electronegative than nitrogen. Why?

• The $N-H$ bonds are shorter than the $N-F$ bonds.
• The lone pair dipole and bond dipoles add up in $NH_3$, but they partially cancel out in $NF_3$.
• Fluorine is a larger atom than hydrogen.
• The molecular geometry of $NH_3$ is different from that of $NF_3$.

12. Which of the following compounds has a zero dipole moment due to its linear geometry?

• $H_2S$
• $CO_2$
• $O_3$
• $SO_2$

13. What is the net dipole moment of $CH_3F$?

• Zero, because it is a tetrahedral molecule.
• Non-zero, because the $C-F$ bond is highly polar and the molecule is not perfectly symmetrical.
• It depends on the orientation of the molecule.
• It is equal to the sum of the $C-H$ bond dipoles.

14. Which of the following compounds has a greater dipole moment, $cis-C_2H_2Cl_2$ or $trans-C_2H_2Cl_2$?

• $trans-C_2H_2Cl_2$
• $cis-C_2H_2Cl_2$
• Both have the same dipole moment.
• Neither has a dipole moment.

15. What is the reason for the non-zero dipole moment of $SF_4$?

• It has a perfect tetrahedral geometry.
• It has a lone pair on the central sulfur atom, making the molecular geometry asymmetrical.
• The bond length of the $S-F$ bonds is very long.
• The electronegativity difference between sulfur and fluorine is very small.

16. Which of the following has a greater dipole moment, $PH_3$ or $NH_3$?

• $PH_3$
• $NH_3$
• Both have the same dipole moment.
• Neither has a dipole moment.

17. A molecule has a non-zero dipole moment. This means the molecule is:

• Symmetrical
• Non-polar
• A perfect tetrahedron
• Polar

18. Why does $CO_2$ have a zero dipole moment while $H_2O$ has a non-zero dipole moment?

• Both molecules are linear.
• The $C=O$ bonds are stronger than the $O-H$ bonds.
• $CO_2$ is linear and symmetrical, while $H_2O$ is bent and asymmetrical.
• The oxygen atom is more electronegative than the carbon atom.

19. The dipole moment of a molecule with a central atom and three identical terminal atoms is zero if the geometry is:

• Trigonal pyramidal
• T-shaped
• Trigonal planar
• Bent

20. Which of the following compounds has the greatest dipole moment?

• Hydrogen fluoride ($HF$)
• Hydrogen chloride ($HCl$)
• Hydrogen bromide ($HBr$)
• Hydrogen iodide ($HI$)

Quiz Results