some metals appear dull?

Asked by  | 17th Sep, 2013, 03:30: PM

Expert Answer:

Metals when exposed to air for a long time develop a thin layer of oxide,carbonate or sulphide by the slow action of the various gases present in air.Due to oxidation, a new layer is formed giving the metals a dull appearance.

Answered by Vaibhav Chavan | 18th Sep, 2013, 08:56: AM

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