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Chemistry
Which of the following compounds is not coloured?
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Q. Which of the following compounds is not coloured?
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VITEEE 2010
A
$Na _{2}\left[ Cu ( Cl )_{4}\right]$
12%
B
$Na[Cd(Cl)_4]$
50%
C
$K_4[Fe(CN)_6]$
25%
D
$K_3[Fe(CN)_6]$
12%
Solution:
Complex compound having lack of unpaired electron is colourless. Among the given complexes, $K _{4}\left[ Fe ( CN )_{6}\right]$ has no unpaired electron as CN $^{-}$leeing strong field ligand causes pairing of electrons. Thus, it is not coloured.