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Covalent Bond vs Ionic Bond

A solid that ...

Question

A solid that is not transparent to visible light and whose electrical conductivity increases with temperature is formed by:

A

ionic bonding

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B

covalent bonding

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C

metallic bonding

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D

van der waals' bonding

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Solution

The correct option is B covalent bonding
Electrical conductivity of a semi-conductor increases with increase in temperature. Also a semi-conductor consists of covalent bond (by sharing of electrons between the constituent atoms). Thus, the given solid must be formed by covalent bonding.

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