1. Nitrogen atoms form a
- single bond
- double bond
- triple bond
- ionic bond
Answer: C) triple bond
Explanation: Each nitrogen needs three more electrons, so the two atoms share three pairs: a triple bond.
MCQs / Chemistry / Covalent bonding
Covalent bonding MCQs — Chemistry
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.
2. What is similar about diamond and silicon dioxide?
- Both conduct electricity
- Both are giant covalent structures
- Both are soft solids
- Both contain metal atoms
Answer: B) Both are giant covalent structures
3. Why does iodine have a low melting point?
- Weak forces between molecules
- Weak covalent bonds
- Metallic bonding
- Ionic bonding
Answer: A) Weak forces between molecules
Explanation: Iodine is a simple molecular substance. Melting only overcomes the weak forces between I₂ molecules, not the covalent bond inside each molecule.
4. How many covalent bonds are present in methane?
- 1
- 2
- 3
- 4
Answer: D) 4
Explanation: Carbon forms four C–H single bonds in CH₄.
5. How many lone pairs are on the nitrogen atom in NH₃?
- 0
- 1
- 2
- 3
Answer: B) 1
Explanation: Nitrogen has 5 outer electrons; 3 are used in N–H bonds and the remaining 2 form one lone pair.
6. How many shared electrons are present in water (H₂O)?
- 2
- 4
- 6
- 8
Answer: B) 4
Explanation: Water has two O–H bonds. Two shared pairs = 4 shared electrons.
7. How many shared pairs of electrons are present in CH₄?
- 2
- 3
- 4
- 5
Answer: C) 4
8. In silicon dioxide (SiO₂), each oxygen atom is bonded to
- 1 silicon atom
- 2 silicon atoms
- 3 silicon atoms
- 4 silicon atoms
Answer: B) 2 silicon atoms
9. Which molecule contains only single covalent bonds?
- O₂
- CO₂
- CH₄
- N₂
Answer: C) CH₄
10. Which statement about silicon dioxide is incorrect?
- It has a giant structure
- It has strong covalent bonds
- It has a low melting point
- It is hard
Answer: C) It has a low melting point
11. In both graphite and diamond, carbon atoms are joined by
- metallic bonds
- ionic bonds
- strong covalent bonds
- hydrogen bonds
Answer: C) strong covalent bonds
12. Graphite conducts electricity because
- ions move freely
- electrons are delocalised
- molecules move
- protons move
Answer: B) electrons are delocalised
13. Which statement about methane is correct?
- It contains ionic bonds.
- It conducts electricity.
- Carbon shares electrons with hydrogen atoms.
- It has a giant structure.
Answer: C) Carbon shares electrons with hydrogen atoms.
Explanation: Methane is a simple covalent molecule: carbon shares one electron pair with each of four hydrogen atoms. It has no ions, so it does not conduct.
14. Which substance is not a giant covalent structure?
- Diamond
- Silicon dioxide
- Graphite
- Bromine
Answer: D) Bromine
15. Which statement about diamond is true?
- Each carbon bonds to four others
- It conducts electricity
- It contains molecules
- It is soft
Answer: A) Each carbon bonds to four others
16. Which carbon allotrope is hardest?
- Graphite
- Diamond
- Charcoal
- Coke
Answer: B) Diamond
17. How many electrons are shared in an oxygen molecule (O₂)----?
- 2
- 4
- 6
- 8
Answer: B) 4
Explanation: An O=O double bond is two shared pairs, so 4 electrons are shared.
18. Silicon dioxide contains
- only silicon atoms
- only oxygen atoms
- silicon and oxygen atoms joined by covalent bonds
- ions in a lattice
Answer: C) silicon and oxygen atoms joined by covalent bonds
19. Which statement about silicon dioxide is correct?
- Contains strong covalent bonds throughout
- Conducts electricity
- Made of simple molecules
- Has a low boiling point
Answer: A) Contains strong covalent bonds throughout
20. Which pair has similar structures?
- Diamond and silicon dioxide
- Water and ammonia
- Sodium chloride and methane
- Bromine and iodine
Answer: A) Diamond and silicon dioxide
21. Carbon dioxide contains
- one double bond
- two double bonds
- one triple bond
- four single bonds
Answer: B) two double bonds
Explanation: O=C=O: carbon forms a double bond with each oxygen atom.
22. Which substance has the lowest melting point?
- Diamond
- Silicon dioxide
- Graphite
- Ethanol
Answer: D) Ethanol
23. Graphite is classified as
- simple molecular
- ionic
- giant covalent
- metallic
Answer: C) giant covalent
24. Silicon dioxide has a structure most similar to
- Water
- Diamond
- Sodium chloride
- Methane
Answer: B) Diamond
25. 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
Page 1 of 3 Next
Practise Covalent bonding MCQs