What is the crystalline structure of an intrinsic semiconductor?

In the case of a semiconductor,which of the following statements is wrong?

What is the relationship between the number density of free electrons $(n)$ and temperature $(T)$ in a semiconductor?

Carbon,Silicon,and Germanium atoms have four valence electrons each. Their valence and conduction bands are separated by energy band gaps represented by $(E_g)_C$,$(E_g)_{Si}$,and $(E_g)_{Ge}$ respectively. Which one of the following relationships is true in their case?

Name the primary constitutional unit of semiconductor composition.

Choose the correct statement. In conductors,