Questions on Bond Polarity
Multiple-Choice Questions: Bond Polarity
1. What determines whether a bond is polar or nonpolar?
A) The number of electrons shared
B) The difference in electronegativity between bonded atoms
C) The size of the atoms involved
D) The molecular shape
E) The presence of lone pairs
2. Which of the following bonds is most likely nonpolar?
A) H–Cl
B) O–H
C) Cl–Cl
D) C–O
E) N–H
3. A bond between atoms with an electronegativity difference of 0.1 is:
A) Ionic
B) Polar covalent
C) Nonpolar covalent
D) Metallic
E) Hydrogen bond
4. Which of these bonds is most polar?
A) C–H
B) N–O
C) Na–Cl
D) H–F
E) S–O
5. The bond in Cl₂ molecule is:
A) Polar covalent
B) Nonpolar covalent
C) Ionic
D) Metallic
E) Hydrogen bond
6. Which property is a direct consequence of bond polarity?
A) Atomic mass
B) Molecular weight
C) Dipole moment
D) Boiling point
E) Density
7. A molecule with polar bonds but symmetrical geometry is:
A) Always polar
B) Always nonpolar
C) Sometimes polar, sometimes nonpolar
D) Ionic
E) Metallic
8. What type of bond exists between sodium and chlorine in NaCl?
A) Nonpolar covalent
B) Polar covalent
C) Ionic
D) Metallic
E) Hydrogen bond
9. Which of the following atoms is most electronegative?
A) Sodium (Na)
B) Oxygen (O)
C) Carbon (C)
D) Hydrogen (H)
E) Potassium (K)
10. In which of the following pairs is the bond likely polar?
A) H–H
B) O–O
C) C–C
D) H–Cl
E) Br–Br
11. What is the approximate electronegativity difference that usually defines an ionic bond?
A) 0–0.4
B) 0.5–1.7
C) >1.7
D) 2.5–3.0
E) 1.0–1.5
12. Which bond has a dipole moment?
A) Cl–Cl
B) F–H
C) N–N
D) C–C
E) O–O
13. Which molecule is polar due to bond polarity and shape?
A) CO₂
B) CH₄
C) NH₃
D) CCl₄
E) BF₃
14. Which of these increases bond polarity?
A) Decreasing difference in electronegativity
B) Increasing difference in electronegativity
C) Equal sharing of electrons
D) Larger atomic radius
E) Molecular symmetry
15. Which bond type involves complete transfer of electrons?
A) Polar covalent
B) Nonpolar covalent
C) Ionic
D) Metallic
E) Hydrogen bonding
16. Which factor has the greatest effect on bond polarity?
A) Atomic size
B) Electronegativity difference
C) Number of valence electrons
D) Molecular shape
E) Mass of atoms
17. Which molecule is nonpolar despite having polar bonds?
A) NH₃
B) H₂O
C) CO₂
D) HCl
E) SO₂
18. The polarity of a bond affects which of the following physical properties?
A) Boiling point
B) Atomic mass
C) Isotopic abundance
D) Atomic number
E) Nuclear stability
19. Which statement is true about polar covalent bonds?
A) Electrons are equally shared
B) Electrons are completely transferred
C) Electrons are unequally shared
D) No electrons are shared
E) Only metals form polar covalent bonds
20. Which molecule has the greatest bond polarity?
A) H–H
B) F–H
C) C–H
D) O–O
E) N–N
- Questions on Bond Energy
- Questions on VSEPR Theory
- Questions: Molecular Shapes with and without Lone Pairs
Answers with Explanations
1. B) Bond polarity depends on electronegativity difference.
2. C) Cl–Cl is nonpolar covalent (same atoms).
3. C) Difference 0.1 → Nonpolar covalent.
4. D) H–F has the highest electronegativity difference, so most polar.
5. B) Cl₂ bond is between identical atoms → nonpolar covalent.
6. C) Bond polarity leads to dipole moments.
7. B) Symmetrical molecules with polar bonds are usually nonpolar overall.
8. C) NaCl forms an ionic bond.
9. B) Oxygen is the most electronegative in this list.
10. D) H–Cl is polar due to electronegativity difference.
11. C) Ionic bonds usually have difference >1.7.
12. B) F–H bond has a dipole moment (polar bond).
13. C) NH₃ is polar due to shape and bond polarity.
14. B) Greater electronegativity difference increases polarity.
15. C) Ionic bonds involve complete electron transfer.
16. B) Electronegativity difference affects polarity the most.
17. C) CO₂ is nonpolar because it is symmetrical despite polar bonds.
18. A) Polarity affects boiling points and other physical properties.
19. C) Polar covalent bonds share electrons unequally.
20. B) H–F has the greatest bond polarity due to highest difference.
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