Which of the following ions is colourless in | vedclass

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(C) The $Gd^{3+}$ ion has an electronic configuration of $[Xe] 4f^7$. Although it contains $7$ unpaired electrons,it is colourless because the $f-f$ t

Vedclass · Accepted Answer

$Gd^{3+}$

Vedclass · Answer

(C) The $Gd^{3+}$ ion has an electronic configuration of $[Xe] 4f^7$. Although it contains $7$ unpaired electrons,it is colourless because the $f-f$ transitions are forbidden by the Laporte selection rule and the energy gap is too large for visible light absorption.$La^{3+}$ $(4f^0)$ and $Lu^{3+}$ $(4f^{14})$ are colourless due to the absence of unpaired electrons.$Eu^{3+}$ $(4f^6)$ is coloured due to $f-f$ transitions.Therefore,$Gd^{3+}$ is the correct answer.

Which of the following ions is colourless in spite of the presence of unpaired electrons?

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