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Question

Colour of Fe4[Fe(CN)6]3 is

A
Purple
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B
Blue
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C
White
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D
None of the above
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Solution

The correct option is B Blue
Fe4[Fe(CN)6]3 is Prussian Blue which is blue in colour. This is due to intervalence charge transfer where the excitation and subsequent transfer of electrons from a lower oxidation state cation to neighbouring cation of higher oxidation state.
Hence, Option "b" is the correct answer.

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