First slide

Crystal field theory

Question

Which of the following compounds is brown coloured?

Moderate

A

$Fe [Fe (CN)_{4}]$
B

${Fe}_{4} [Fe (CN)_{6}]$
C

$Fe [Fe (CN)_{6}]$
D

$K_{2} Fe [Fe (CN)_{6}]$

Solution

Fe[Fe(CN)₆] has Fe in +3 oxidation state and is brown colour.

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