The transition metal ions responsible for colour in ruby and emerald are, respectively

  • [JEE MAIN 2016]
  • A

    $Co^{3+}$ and $Cr^{3+}$

  • B

    $Co^{3+}$ and $Co^{3+}$

  • C

    $Cr^{3+}$ and $Cr^{3+}$

  • D

    $Cr^{3+}$ and $Co^{3+}$

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