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Question

Chemistry Question on d block elements

Which of the following compounds is not coloured?

A

Na2[Cu(Cl)4]Na _{2}\left[ Cu ( Cl )_{4}\right]

B

Na[Cd(Cl)4]Na[Cd(Cl)_4]

C

K4[Fe(CN)6]K_4[Fe(CN)_6]

D

K3[Fe(CN)6]K_3[Fe(CN)_6]

Answer

K4[Fe(CN)6]K_4[Fe(CN)_6]

Explanation

Solution

Complex compound having lack of unpaired electron is colourless. Among the given complexes, K4[Fe(CN)6]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.

So, the correct option is (C): K4[Fe(CN)6]K_4[Fe(CN)_6]