Metal lose ______ because of acid present in rain.

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Solution

Metals: Metals are substances that form naturally below the surface of the Earth. Most metals are lustrous or shiny. Metals are inorganic, which means they are made of substances that were never alive.
Due to the existence of free electrons, metals reflect light, giving them their characteristic shine.
Metallic lustre is the term used to describe the gleaming surface of pure metals.
Because there are many free-moving electrons on the surface of metals, light that strikes the metal will be specularly reflected by the free electrons.
These metals have a propensity to react with substances like carbon and oxygen when exposed to air, resulting in the formation of a thin coating on the metals' surfaces.
Thus metals lose their lustre.
Either cleaning the metal's surface or applying the right chemicals can restore its lustre.
Metal lose lustre because of acid present in rain.

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