51. Which substance has a giant covalent structure?
- Methane
- Diamond
- Water
- Carbon dioxide
Answer: B) Diamond
MCQs / Chemistry / Covalent bonding
Covalent bonding MCQs — Chemistry (page 3)
63 multiple-choice questions on Covalent bonding from Chemistry, each with the correct answer and, where available, a teacher's explanation. Read through them to revise the chapter, then practise the same questions one by one to test yourself.
52. Which molecule contains a double bond?
- H₂O
- CH₄
- O₂
- NH₃
Answer: C) O₂
53. Why is graphite used as a lubricant?
- Layers slide easily
- It melts quickly
- It is ionic
- It dissolves in water
Answer: A) Layers slide easily
54. Why is graphite used in pencils?
- It is hard
- It melts easily
- Layers slide over each other
- It is ionic
Answer: C) Layers slide over each other
55. Which molecule contains a double covalent bond between two atoms of the same element?
- H₂
- O₂
- CH₄
- NH₃
Answer: B) O₂
Explanation: O₂ is O=O: two oxygen atoms share two pairs of electrons. H₂ has a single bond, and CH₄ / NH₃ join different elements.
56. Which form of carbon conducts electricity?
- Diamond
- Graphite
- Fullerene (simple molecular)
- None
Answer: B) Graphite
57. Why does diamond not conduct electricity?
- It has no electrons
- It has no ions
- It has no mobile electrons
- It has weak bonds
Answer: C) It has no mobile electrons
58. Which property is shown by diamond?
- Conducts electricity
- Soft and slippery
- Very hard
- Low melting point
Answer: C) Very hard
59. How many shared pairs of electrons are present in CO₂?
- 2
- 3
- 4
- 6
Answer: C) 4
Explanation: Two C=O double bonds × 2 pairs each = 4 shared pairs.
60. A single covalent bond consists of
- one shared electron
- one shared pair of electrons
- two transferred electrons
- four shared electrons
Answer: B) one shared pair of electrons
Explanation: A single covalent bond is one pair (two electrons) shared between two atoms.
61. Why is silicon dioxide hard?
- Giant covalent structure
- Metallic bonding
- Ionic lattice
- Weak intermolecular forces
Answer: A) Giant covalent structure
62. Ethene (C₂H₄) contains
- one double bond
- two double bonds
- one triple bond
- ionic bonding
Answer: A) one double bond
63. Balance: CH4 + ?O2 - CO2 + 2H2O. What number replaces “?”
- 1
- 2
- 3
- 4
Answer: B) 2
Explanation: Right side has 2 + 2 = 4 oxygen atoms, so we need 2O2: CH4 + 2O2 - CO2 + 2H2O.
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