Which onr of the following statements is wrong ?
Which onr of the following statements is wrong ?
A. The conductivity of metals decreases with increase in temperature
B. The conductivity of semiconductors increases with increase in temperature
C. There is no superconductor at room temper -ture
D. Ionic solids conduct electricity due to presence of ions .
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Correct Answer - D
Ionic solids conduct electricity not due to presence of ions but due to presence of defects .
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