Which of the following statements is incorrect?

$A$ pure semiconductor behaves slightly as a conductor at

Write the electronic configuration of $Si$ and $Ge$.

This question has Statement $1$ and Statement $2$. Of the four choices given after the Statements,choose the one that best describes the two Statements.
Statement $1$ : $A$ pure semiconductor has a negative temperature coefficient of resistance.
Statement $2$ : On raising the temperature,more charge carriers are released into the conduction band.

If the lattice constant of this semiconductor is decreased,then which of the following is correct?

Which of the following statements is incorrect?