Science, asked by vchandola451, 10 months ago

Why some materials lose their shine and appear dull

Answers

Answered by muditgunwal
2

Answer:

it is due to the corrosion of their surface.

Eg:-

  1. silver corrodes to form a green layer of Ag2S over its surface.
  2. iron corrodes to form brownish flaky layer of Fe2O3.xH2O. o er its surface.
  3. copper corrodes to form a green layer of CuCO3 over its surface.
  4. Aluminium corrodes to form a layer of Al2O3 over its surface.

the Ayer formed after corrosion is dull and I present on the !

material's surface and make it look dull.

the shine can be restores by removing the outer layer of the corroded material.

Note:- corrosion is a surface phenomena so the metal is still shining inside that layer.

HOPE THAT HELPS.

Please Mark It As BrAinLIesT.

Answered by 123prashant76
1

Because of rusting and like that is responsible for the materials shine

And some time cotting on them will matter

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