Minority carriers in a $p$-type semiconductor are

Which one of the following statements is false?

Write the formula for the total current in an intrinsic semiconductor.

In an $n$-type semiconductor,the free electrons donated by the impurity atoms occupy energy levels in:

Which of the following is an inorganic compound semiconductor?

What is the number density of donor atoms which must be added to a pure germanium semiconductor to make an $n$-type semiconductor of conductivity $6.4 \ \Omega^{-1} \ cm^{-1}$? The mobility of electrons in $n$-type germanium is $4 \times 10^3 \ cm^2 \ V^{-1} \ s^{-1}$. Neglect the contribution of holes to conductivity.