copper pipe become black after long duration of use
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It becomes black due to corrosive property of metals. In our atmosphere it get wears by moisture and other gases present in the atmosphere. Please mark me as Brainliest.
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Oxidation. Oxidization, a chemical reaction between copper and oxygen, can turn a copper pot black. When heated, copper can develop a layer of brownish-black copper oxide. If it is not polished away, the copper oxide will react with the air's moisture to form copper carbonate, which is green in color.
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