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The gemestone ruby is an impure form of alumina having impurity

$ (a)\;\text{Tin and lead} \\(b)\;\text{Chromium.} \\(c)\; \text{ Manganese} \\ (d)\;\text{Zinc} $
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The colouration of stone is because of its impurity.
Hence b is the correct answer.
answered Mar 20, 2014 by meena.p
 

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