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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Conductivity UP with Temperature = Semiconductor = Covalent Bonding.
Updated On: May 14, 2026
- covalent bonding
- van der Waal's bonding
- co-ordinate bonding
- ionic bonding
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The Correct Option is A
Solution and Explanation
Step 1: Concept
The description refers to a semiconductor. Semiconductors are typically not transparent and show an increase in conductivity as temperature rises.
Step 2: Meaning
In semiconductors, an increase in temperature provides enough energy for electrons to jump from the valence band to the conduction band.
Step 3: Analysis
Elemental semiconductors like Silicon and Germanium are held together by strong covalent bonds. While metals (metallic bonding) decrease in conductivity with temperature, covalent solids like semiconductors exhibit the opposite behavior.
Step 4: Conclusion
Covalent bonding is the characteristic bond type for these materials. Final Answer: (A)
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