Chapter-3 Chemical Bonding — Online MCQ Test
CHEMISTRY · Grade 10 · IGCSE cambridge
Practice Chapter-3 Chemical Bonding with a free chapter-wise online MCQ test.
This chapter covers: Ionic covalent and metallic bonding and how bonding explains the properties of substances..
AI-generated questions from basic to board-exam level, with instant results and explanations.
Chapter-3 Chemical Bonding — Important Questions & Answers
Which type of bonding involves the transfer of electrons from one atom to another?
- A. Covalent bonding
- B. Ionic bonding
- C. Metallic bonding
- D. Coordinate bonding
Answer: B. Ionic bonding
Ionic bonding occurs when electrons are completely transferred from a metal atom to a non-metal atom, forming ions that are held together by electrostatic attraction.
Ionic bonding occurs when electrons are completely transferred from a metal atom to a non-metal atom, forming ions that are held together by electrostatic attraction.
What is the name of the bond formed when a pair of electrons is shared between two atoms?
- A. Ionic bond
- B. Metallic bond
- C. Covalent bond
- D. Hydrogen bond
Answer: C. Covalent bond
A covalent bond is formed by the sharing of electron pairs between two non-metal atoms, allowing both atoms to achieve stable electron configurations.
A covalent bond is formed by the sharing of electron pairs between two non-metal atoms, allowing both atoms to achieve stable electron configurations.
Why do ionic compounds typically have high melting points?
- A. Because they contain covalent bonds
- B. Because of the strong electrostatic forces between ions
- C. Because they have metallic bonding
- D. Because they are gases at room temperature
Answer: B. Because of the strong electrostatic forces between ions
Ionic compounds have high melting points due to strong electrostatic attractions between oppositely charged ions, which require significant energy to overcome.
Ionic compounds have high melting points due to strong electrostatic attractions between oppositely charged ions, which require significant energy to overcome.
Which of the following would conduct electricity when molten but not when solid?
- A. Copper
- B. Diamond
- C. Magnesium oxide
- D. Sulfur
Answer: C. Magnesium oxide
Magnesium oxide is an ionic compound that conducts electricity only when molten because ions become mobile and free to move when the solid lattice breaks down.
Magnesium oxide is an ionic compound that conducts electricity only when molten because ions become mobile and free to move when the solid lattice breaks down.
Which of the following represents a compound where the bonding is predominantly covalent with significant electronegativity differences?
- A. Hâ‚‚ gas
- B. HCl gas
- C. KBr crystal
- D. Fe metal
Answer: B. HCl gas
HCl has polar covalent bonding due to significant electronegativity difference between hydrogen (2.20) and chlorine (3.16), creating a partially polar covalent bond rather than pure ionic or non-polar covalent.
HCl has polar covalent bonding due to significant electronegativity difference between hydrogen (2.20) and chlorine (3.16), creating a partially polar covalent bond rather than pure ionic or non-polar covalent.