Discussion
The INCORRECT statement is
Answer: E
The incorrect statement is the energy band gap of Ge is greater than 4 eV.
Germanium's band gap is only about 0.7 eV, which is what makes it a semiconductor. A gap above about 3 eV is typical of insulators; diamond's is about 5.5 eV.
The other statements are correct: germanium and silicon crystallise in the diamond-like lattice, silicon has four electrons in its outermost shell, semiconductors have band gaps below about 3 eV, and in pure (intrinsic) germanium every electron freed into the conduction band leaves a hole, so the numbers of free electrons and holes are equal.
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