What type of solid is ice?

Which of the following is an example of a network solid?

Find the volume occupied by a particle in a simple cubic unit cell if the radius of a particle in it is $190 \text{ pm}$.

Which among the following is ferromagnetic in nature?

Which one of the following elements, when present as an impurity in silicon, makes it a $p$-type semiconductor?

Classify the following materials into superconductors,conductors,semiconductors,and insulators: $Cu$,$Al$,$Si$,$Ge$,glass,Teflon,$Au$,$Pt$,$CuO$ (at low temperature),graphite,carbon black,and alloys at low temperature.