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 $Co^{3+}$

Similar Questions

$Zn$ and $Cd$ metals do not show variable valency because

Which metal is present in brass, bronze and German silver

  • [AIIMS 1999]

The spin only magnetic moment of $\left[ ZCl _{4}\right]^{2-}$ is $3.87 \,BM,$ where $Z$ is $.....$

  • [KVPY 2015]

Which one of the following metals will not reduce ${H_2}O$

Consider the hydrated ions of $Ti^{2+}, V^{2+}, Ti^{3+}$ and $Sc^{3+}$. The correct order of their spin-only magnetic moments is

  • [JEE MAIN 2019]