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The red colour of ruby comes from which ion present in Al₂O₃?
ACr³⁺
BCo²⁺
CTi³⁺
DFe³⁺
Answer & Solution
Correct answer: A. Cr³⁺
Ruby contains about 0.5 to 1 percent Cr³⁺ in alumina, and d-d transitions at these ions give the colour.
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