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Question
A solid which is not transparent to visible light and whose conductivity increases with temperature is formed by :
A solid which is not transparent to visible light and whose conductivity increases with temperature is formed by :
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Solution
The correct option is A ionic bonding
Ionic bonding is present in ionic solids. With the increase of temperature, the number of defects in lattice increases which increases the ease of movement of ions and hence the conductivity increases. In metallic bonding, conductivity decreases due to increase in scattering of electrons and hence less ease of flow.
Ionic bonding is present in ionic solids. With the increase of temperature, the number of defects in lattice increases which increases the ease of movement of ions and hence the conductivity increases. In metallic bonding, conductivity decreases due to increase in scattering of electrons and hence less ease of flow.
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