Chemical Bonding & Molecular Structure MCQs: Ionic, covalent, and metallic bonds

Introduction: Chemical bonding is essential for understanding how atoms combine to form molecules and compounds. There are three main types of bonds: ionic bonds, which involve the transfer of electrons; covalent bonds, where electrons are shared between atoms; and metallic bonds, which consist of a “sea of electrons” that allows metals to conduct electricity. These bonds determine the properties, strength, and stability of different substances in chemistry.

1. Which of the following is an example of an ionic bond?
   (a) H₂O
   (b) NaCl
   (c) CO₂
   (d) NH₃
   
2. What happens in a covalent bond?
   (a) Electrons are transferred
   (b) Electrons are shared
   (c) Electrons are lost
   (d) Protons are gained
   
3. Which type of bond is found in metals?
   (a) Ionic bond
   (b) Covalent bond
   (c) Metallic bond
   (d) Hydrogen bond
   
4. In an ionic bond, the atom that loses an electron becomes a:
   (a) Cation
   (b) Anion
   (c) Neutral atom
   (d) Radical
   
5. Which molecule contains a double covalent bond?
   (a) O₂
   (b) CO₂
   (c) HCl
   (d) NaCl
   
6. Which of the following has a triple covalent bond?
   (a) Oxygen (O₂)
   (b) Nitrogen (N₂)
   (c) Hydrogen (H₂)
   (d) Carbon dioxide (CO₂)
   
7. Which property is characteristic of ionic compounds?
   (a) Low melting point
   (b) High conductivity in molten state
   (c) Solubility in non-polar solvents
   (d) High malleability
   
8. What type of bonding is present in diamond?
   (a) Ionic
   (b) Covalent
   (c) Metallic
   (d) Hydrogen bonding
   
9. Which element is most likely to form an ionic bond with chlorine?
   (a) Oxygen
   (b) Sodium
   (c) Carbon
   (d) Hydrogen
   
10. What is the key feature of metallic bonding?
    (a) Localized electrons forming dipoles
    (b) Free-moving valence electrons
    (c) Shared electron pairs
    (d) Electrostatic forces between ions
    
11. Which of the following bonds is the strongest?
    (a) Ionic bond
    (b) Covalent bond
    (c) Metallic bond
    (d) Van der Waals forces
    
12. Which type of bond is found in NaCl?
    (a) Covalent
    (b) Metallic
    (c) Ionic
    (d) Hydrogen
    
13. Metallic bonds are best described as:
    (a) Localized electrons forming dipoles
    (b) Free-moving valence electrons
    (c) Shared electron pairs
    (d) Electrostatic forces between ions
    
14. Which type of bond results in the highest melting point?
    (a) Ionic
    (b) Covalent
    (c) Metallic
    (d) Hydrogen bonding
    
15. Which of the following elements will form a covalent bond?
    (a) Sodium and chlorine
    (b) Hydrogen and oxygen
    (c) Magnesium and oxygen
    (d) Lithium and fluorine
    

Answer Key

1. (b) NaCl
2. (b) Electrons are shared
3. (c) Metallic bond
4. (a) Cation
5. (b) CO₂
6. (b) Nitrogen (N₂)
7. (b) High conductivity in molten state
8. (b) Covalent
9. (b) Sodium
10. (b) Free-moving valence electrons
11. (b) Covalent bond
12. (c) Ionic
13. (b) Free-moving valence electrons
14. (a) Ionic
15. (b) Hydrogen and oxygen