Question

Which of the following is a covalent solid?

• A. Iron
• B. Diamond
• C. Sodium chloride
• D. Copper

Hint:

Covalent solids are hard and have very high melting points due to strong covalent bonds throughout the lattice.

Answer 1

The Correct Option is B

Step 1: Types of solids.
- Metallic solids: Iron, Copper.
- Ionic solids: Sodium chloride.
- Covalent (network) solids: Diamond, quartz.
Step 2: Analysis.
Diamond is a covalent solid because each carbon atom is covalently bonded to four other carbon atoms in a tetrahedral arrangement, forming a giant covalent lattice.
Step 3: Conclusion.
Thus, the correct answer is (B) Diamond.