A) $ Na_2[CuCl_6] $
B) $ Na_2[CdCl_4] $
C) $ K_4[Fe{{( CN )}_6}] $
D) $ K_3[Fe{{(CN)}_6}] $
Correct Answer: B
$ Na_2[CdCl_4] $ does not contain any unpaired electron hence colourless
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