# How to find whether a coordination compounds are colored or not? explain this question  Q.37. Which of the following compounds is not coloured ? (a) $N{a}_{2}\left[CuC{l}_{4}\right]$ (b) $N{a}_{2}\left[CdC{l}_{4}\right]$ (c) ${K}_{4}\left[Fe{\left(CN\right)}_{6}\right]$ (d) ${K}_{3}\left[Fe{\left(CN\right)}_{6}\right]$

B )
In Na2[CdCl4],Central atom Cd has no unpaired electrons. Na2[CdCl4], compounds is not coloured because of central atom Cd which has d10 electronic configuration so transition do not occur.

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