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The metal that is sometimes found native in nature .

$ (a)\;\text{aluminium.} \\(b)\;\text{copper.} \\(c)\;\text{iron} \\ (d)\;\text{magnesium.} $
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Copper is very slowly attacked by air, mopisture and carbon dioxide and hence, sometimes occurs in the native state.
Hence b is the correct answer.
answered Mar 20, 2014 by meena.p

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