Which of the following oxides behaves as conductor or insulator depending upon temperature
a. TiO
b. SiO2
c. TiO3
d. MgO
Ans. c
Explanation : Certain metal oxides like VO 2, VO, VO 3 and TiO 3 show metallic or insulating property depending upon temperature, as temperature varies metalllic or insulating property varies. This is due to variation in energy gap between conduction band and valence band.
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