SiO₂, covalent solid, insulator, high melting point
MgO, covalent solid, insulator, high melting point
H₂O (ice), molecular solid, insulator, low melting point
Ag(s), metallic solid, conductor, high melting point
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The Correct Option isB
Solution and Explanation
Step 1: Understanding the Classifications
- SiO₂ is correctly classified as a covalent solid.
- MgO is incorrectly classified as a covalent solid (it is an ionic solid).
- H₂O (ice) is correctly classified as a molecular solid.
- Ag is correctly classified as a metallic solid.
Thus, MgO's classification is incorrect.