Which of the following compounds is not colou | vedclass

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(B) compound is coloured if it has unpaired electrons in its $d$-orbitals,allowing for $d-d$ transitions.In $Na_2[CuCl_4]$,$Cu^{2+}$ has a $3d^9$ conf

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$Na_2[CdCl_4]$

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(B) compound is coloured if it has unpaired electrons in its $d$-orbitals,allowing for $d-d$ transitions.In $Na_2[CuCl_4]$,$Cu^{2+}$ has a $3d^9$ configuration with $1$ unpaired electron,so it is coloured.In $Na_2[CdCl_4]$,$Cd^{2+}$ has a $4d^{10}$ configuration. Since all $d$-orbitals are completely filled,no $d-d$ transition is possible,making it colourless.In $K_4[Fe(CN)_6]$,$Fe^{2+}$ is $3d^6$ (low spin),which is diamagnetic but often shows colour due to charge transfer,however,$Cd^{2+}$ complexes are characteristically colourless due to the $d^{10}$ configuration.In $K_3[Fe(CN)_6]$,$Fe^{3+}$ is $3d^5$,which is coloured.

Which of the following compounds is not coloured?

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