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 C u C l 4
(b) N a 2 C d C l 4
(c) K 4 F e C N 6
(d) K 3 F e C N 6

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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