Which of the following oxides behaves as conductor or insulator depending upon temperature?
(i) TiO
(ii)
(iii)
(iv) MgO
The answer is option (iii)
behaves as conductor or insulator based on temperature. The variation of energy gap between valence band and conduction band with the variation of temperature plays an important role in it. When heated, electrons gain energy, which helps them cross this band gap.