Question
Chemistry Question on d block elements
Which of the following compounds is not coloured?
A
Na2[Cu(Cl)4]
B
Na[Cd(Cl)4]
C
K4[Fe(CN)6]
D
K3[Fe(CN)6]
Answer
K4[Fe(CN)6]
Explanation
Solution
Complex compound having lack of unpaired electron is colourless. Among the given complexes, K4[Fe(CN)6] has no unpaired electron as CN −leeing strong field ligand causes pairing of electrons. Thus, it is not coloured.
So, the correct option is (C): K4[Fe(CN)6]