Pure silicon at 0 K is

Correct answer: insulator

Explanation: ✅ Correct Answer: C. insulator 📚 Explanation: At absolute zero temperature (0 K), 'pure silicon' behaves as a perfect 'insulator'. This is because all the valence electrons are tightly bound in their bonds, and there is no thermal energy to move them. Silicon is a semiconductor, meaning its conductivity increases as temperature rises. At 0 K, however, there are no free charge carriers available to conduct electricity.