What type of semiconductor is obtained by doping $Ge$ with $As$ $(P, Sb, Bi)$?

Which one of the following is the most correct statement?

Give examples of ferrimagnetism.

Explain the following with suitable examples:
$(ii)$ Paramagnetism

Explain electron-rich impurities and electron-deficient impurities in semiconductors.

Choose the correct option for crystalline solids based on the following statements:
$(1)$ They do not have a sharp melting point.
$(2)$ They gradually soften upon heating.
$(3)$ They have an irregular three-dimensional arrangement.
$(4)$ They show a rapid change in volume upon heating.