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| Q. |
The lustre of the metals is because of – |
| A. | high density, due to closed packing of atoms |
| B. | high polish |
| C. | reflection of light due to the presence of free electrons |
| D. | absorption of light due to the presence of cavities |
| Answer» C. reflection of light due to the presence of free electrons | |
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Explanation: Lustre (or luster) is the way light interacts with the surface of a crystal, rock, or mineral. The word traces its origins back to the latin lux, meaning "light", and generally implies radiance, gloss, or brilliance. Metals in general have high electrical conductivity, high thermal conductivity, and high density. Typically they are malleable and ductile, deforming -under stress without cleaving. |
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