Q.

The luster of a metal is due to -

A. high polishing
B. high density
C. chemical inertness
D. presence of free electrons
Answer» D. presence of free electrons
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.
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