Answers

2016-04-08T18:12:09+05:30
Because metal oxides along wid dust get settled on them. Hope I helped u.. Plzz mark as the BRAINLIEST answer..
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Plzz mark as the BRAINLIEST answer
2016-04-13T15:13:07+05:30
Copper vessels lose their shine when exposed to air because of corrosion
the corroded copper will be green in colour
 it forms metal oxide when exposed to air
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