Which type of bonding gives rise to a solid that does not allow visible light to pass through and whose electrical conductivity rises as temperature increases?

Ionic bonding
Covalent bonding
Van der Waals bonding
Metallic bonding

Correct answer: Covalent bonding

Solution

A solid opaque to visible light whose conductivity increases with temperature is a semiconductor (e.g. Si, Ge), which is held together by covalent bonding.

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