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JEE Main · 2006 · 30 Apr 2006 · Offline · Semiconductors

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A solid which is transparent to visible light and whose conductivity increases with temperature is formed by
  1. (A)Metallic binding
  2. (B)Ionic binding
  3. (C)Covalent binding✓ Correct
  4. (D)Van der Waals binding

Answer: (C)

Solution

A solid transparent to visible light must have a band gap wider than the energy of visible photons, so visible light passes through without exciting electrons. That its conductivity rises with temperature is the signature of a semiconductor, where heating lifts electrons across the gap. Crystals of this kind, such as diamond or silicon, are held together by shared electron pairs, so the binding is covalent.

JEE Main · 2006 · 30 Apr 2006 · Offline · Single correct option

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