Which of the following elements forms a colou | vedclass

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(D) The colour of transition metal ions is primarily due to $d-d$ transitions. For an ion to be coloured,it must have an incomplete $d$-subshell (i.e.

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$Cr^{3+}$

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(D) The colour of transition metal ions is primarily due to $d-d$ transitions. For an ion to be coloured,it must have an incomplete $d$-subshell (i.e.,$d^1$ to $d^9$ configuration). $1$. $Sc^{3+}$ $(3d^0)$: No $d$-electrons,hence colourless. $2$. $Ti^{4+}$ $(3d^0)$: No $d$-electrons,hence colourless. $3$. $Zn^{2+}$ $(3d^{10})$: Completely filled $d$-subshell,hence colourless. $4$. $Cr^{3+}$ $(3d^3)$: Has three unpaired electrons in the $d$-subshell,allowing for $d-d$ transitions,hence it forms coloured compounds. Therefore,the correct option is $D$.

Which of the following elements forms a coloured compound in its respective oxidation state?

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