Q. 13

Which of the following oxides behaves as conductor or insulator depending upon temperature?
A. TiO

B. SiO2

C. TiO3

D. MgO

Answer :

TiO3 behaves as conductor or insulator mainly because of the energy gap variability between valence band and conduction band. This gap changes in accordance with temperature; as the temperature increases so decreases the gap and it leads to more conductive nature which is opposite in case of lowering of temperatures.


Options (i) TiO (ii) SiO2 and (iv) MgO are incorrect .


TiO which behaves like a metal also can conduct electricity because the d-electrons are partially filled and leads to electrical conductivity.


(ii) SiO2 (quartz) is a network -solid which is covalent in nature and always behave as an insulator.



And (iv) MgO is an ionic crystalline solid which means it acts as an insulator in the solid-state and conducts electricity in the molten or aqueous state.


mmmmmmm.jpg

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