Chemical Bonding & Molecular Structure Quiz - ICSE Class 11 Chemistry

Free practice quiz: Chemical Bonding & Molecular Structure (ICSE Class 11 Chemistry). 49 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

This ICSE Class 11 Chemistry practice quiz has 49 multiple-choice questions on Chemical Bonding & Molecular Structure, and 49 of them come with an explanation. Try the 5 sample questions below (tap an option to check yourself), then play the full quiz online. No sign-up needed.

Sample questions

1. Which of the following molecules exhibits both sigma and pi bonds in its bonding structure?

   1. H₂
   2. O₂
   3. N₂
   4. C₂H₂
   Show answer

   Answer: D. C₂H₂

   Acetylene (C₂H₂) has a triple bond between the carbon atoms (one sigma, two pi) and single bonds between each carbon and hydrogen (sigma bonds). Hydrogen (H₂) has a single sigma bond. Oxygen (O₂) has a double bond (one sigma, one pi). Nitrogen (N₂) has a triple bond (one sigma, two pi). The question asks for a molecule exhibiting *both* sigma and pi bonds within its structure, and C₂H₂ fits this perfectly with its C-C triple bond.

2. According to Fajan's rules, covalent character in an ionic bond increases with:

   1. Larger cation size, smaller anion charge
   2. Smaller cation size, larger anion charge
   3. Larger cation size, larger anion charge
   4. Smaller cation size, smaller anion charge
   Show answer

   Answer: B. Smaller cation size, larger anion charge

   Fajan's rules state that covalent character increases with: 1. Small cation size (high charge density), 2. Large anion size (easily polarizable), 3. High charge on cation and anion. Therefore, a smaller cation and a larger anion, both with higher charges, will lead to greater polarization and thus more covalent character.

3. Which of the following is NOT a characteristic of a polar covalent bond?

   1. Unequal sharing of electrons
   2. Presence of a dipole moment
   3. Formation due to large electronegativity difference
   4. Complete transfer of electrons
   Show answer

   Answer: D. Complete transfer of electrons

   A polar covalent bond is characterized by unequal sharing of electrons due to a significant electronegativity difference between the bonded atoms, resulting in a partial positive charge on one atom and a partial negative charge on the other, creating a dipole moment. Complete transfer of electrons leads to the formation of ionic bonds.

4. The hybridization of the central sulfur atom in SO₂ is:

   1. sp
   2. sp²
   3. sp³
   4. dsp²
   Show answer

   Answer: B. sp²

   In SO₂, sulfur is bonded to two oxygen atoms and has one lone pair. The Lewis structure shows a double bond between S and one O, and a single bond with a coordinate bond to the other O, or resonance structures with partial double bonds. In VSEPR terms, sulfur has 3 electron groups (2 bonding domains + 1 lone pair). This corresponds to sp² hybridization, leading to a bent molecular geometry.

5. The presence of a lone pair of electrons on the central atom of a molecule will generally cause:

   1. An increase in bond angle
   2. A decrease in bond angle
   3. No change in bond angle
   4. Rotation around bonds
   Show answer

   Answer: B. A decrease in bond angle

   Lone pairs of electrons occupy more space and exert greater repulsive forces on bonding pairs than bonding pairs do on each other. This repulsion pushes the bonding pairs closer together, leading to a decrease in bond angles compared to a molecule with the same hybridization but no lone pairs.

More questions in this quiz

Answers and explanations are in the full quiz.

1. The bond angle in the methane molecule (CH₄) is approximately:
2. Which of the following species has the highest bond order?
3. The hybridization of the central atom in SF₆ is:
4. Which of the following is an example of a coordinate covalent bond?
5. The dipole moment of which molecule is zero?
6. The molecule BF₃ is:
7. Which factor is most important in determining the polarity of a molecule?
8. In the formation of N₂ molecule, how many sigma and pi bonds are formed between the two nitrogen atoms?
9. Which of the following molecules has a bond angle closest to 180°?
10. The hybridization of the central atom in water (H₂O) is:
11. Which hybridization scheme results in a planar trigonal electron geometry?
12. The bond polarity of a diatomic molecule is solely determined by:
13. In a double covalent bond, there is/are:
14. Which of the following compounds has ionic character?
15. The molecule XeF₄ has which of the following geometrical arrangements of electron pairs and molecular shape, respectively?
16. Which of the following statements regarding bond enthalpy is correct?
17. The hybridization of the central atom in NH₃ is:
18. The bond length order in the oxygen species O₂⁻, O₂, O₂⁺ is:
19. The molecule PCl₅ has which hybridization and molecular geometry, respectively?
20. Hydrogen bonding is strongest in which of the following compounds?
21. Which of the following is an example of resonance in chemical bonding?
22. Which molecule exhibits intramolecular hydrogen bonding?
23. The bond angle in beryllium chloride (BeCl₂) molecule is:
24. The formation of a covalent bond involves:
25. Which statement is FALSE regarding ionic compounds?
26. Which of the following is an example of hydrogen bonding?
27. The molecule PCl₃ has which hybridization and molecular geometry, respectively?
28. Which of the following has the highest boiling point?
29. In which of the following molecules is the bond angle expected to be the smallest?
30. Which type of hybridization is observed in benzene (C₆H₆)?
31. The phenomenon of resonance in polyatomic molecules is due to:
32. Which of the following factors contributes least to the strength of a covalent bond?
33. Which statement is correct about Van der Waals forces?
34. The molecule SF₆ has which hybridization and molecular geometry, respectively?
35. Which of the following correctly orders the electronegativity of the elements?
36. Which force is responsible for the solubility of ionic compounds in polar solvents like water?
37. Which of the following molecules has a net dipole moment of zero due to symmetry?
38. In an ionic bond, the electrostatic attraction exists between:
39. According to Molecular Orbital Theory, the bond order of He₂ molecule is:
40. Which hybridization corresponds to a trigonal bipyramidal electron geometry?
41. The strength of London dispersion forces depends on:
42. Which of the following is a characteristic of a sigma (σ) bond?
43. The correct Lewis structure for carbon dioxide (CO₂) shows:
44. Which of the following molecules is planar?

More quizzes

• Chemical Thermodynamics▶ Play
• Classification of Elements & Periodicity in Properties▶ Play
• Equilibrium (Chemical & Ionic)▶ Play
• Hydrocarbons (Aliphatic & Aromatic)▶ Play
• Hydrogen▶ Play
• Redox Reactions▶ Play

Browse all Chemistry quizzes

More to play