Metals lose___________ because of acid present in rain.

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Solution

Corrosion of metals:
The lustre of metals is because of the reflection of light due to the presence of free electrons.
The substances which are made up of metals like gold and silver ornaments slowly lose their lustre because of the acids present in the rain.
When metals are attacked by acid, it is said to be corroded and this process is known as corrosion.
After losing their lustre due to acid rain, their surface becomes dull and rough.
Hence, metals lose lustre because of acid present in rain.

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