[" The transition metal ions "],[" respo...

[" The transition metal ions "],[" responsible for color in ruby "],[" and emerald are,respectively: "],[" (1) "Co^(3+)" and "Cr^(3+)],[" (2) "Co^(3+)" and "Co^(3+)],[" (3) "Cr^(3+)" and "Cr^(3+)],[" (4) "Cr^(3+)" and "Co^(3+)]

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[" The transition metal ions "],[" responsible for color in ruby "],[" and emerald are,respectively: "],[" (1) "Co^(3+)" and "Cr^(3+)],[" (2) "Co^(3+)" and "Co^(3+)],[" (3) "Cr^(3+)" and "Cr^(3+)],[" (4) "Cr^(3+)" and "Co^(3+)]

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