Question

which of the following is not a property of most network solids (excluding graphite)? very hard very brittle extreme melting and boiling points conducts electricity

Explanation:

Network solids (e.g., diamond, SiO₂) have a 3D covalent bond network. They are hard, brittle, and have high melting/boiling points due to strong covalent bonds. Most lack free electrons/ions, so they don’t conduct electricity (graphite is an exception, excluded here).

Answer:

conducts electricity