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D and F Block Elements question

2016 · 10 Apr · Shift 1 · Q9
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D and F Block Elements question

2016 · 10 Apr · Shift 1 · Q9

JEE MainChemistryD and F Block ElementsMCQ+4 / −1
The transition metal ions responsible for color in ruby and emerald are, respectively :
  1. A
    Cr3+Cr^{3+}Cr3+ and Co3+Co^{3+}Co3+
  2. B
    Co3+Co^{3+}Co3+ and Cr3+Cr^{3+}Cr3+
  3. C
    Co3+Co^{3+}Co3+ and Co3+Co^{3+}Co3+
  4. D
    Cr3+Cr^{3+}Cr3+ and Cr3+Cr^{3+}Cr3+
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