A solid reflects incident light and its electrical conductivity decreases with temperature. The binding in these solids

Ionic

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Covalent

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Metallic

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Molecular

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Solution

The correct option is C
Metallic

The explanation for the correct option:
Metals reflect incident light by the vibrations of free electrons under the influence of the electric field of the incident wave. The conductivity of metals decreases with the increase in temperature due to an increase in the random motion of free electrons. The bonding is therefore metallic.
Hence, Option ‘C’ is correct.

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