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Q.

Which one of the following complexes is violet in color?

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a

[Fe(CN)5NOS]4–

b

Fe4[Fe(CN)6]3.H2O

c

[Fe(CN)6]4–

d

[Fe(SCN)6]4–

answer is D.

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Detailed Solution

In coordination compounds the color of complex compound is due to d-d transition.

[Fe(CN)6]4− it has Plate yellow color , [Fe(CN)6]3−It has Yellow color,  Fe(SCN)3It has Red color [Fe(CN)5(NOS)]4−has Violet colour

Hence, correct Option is: D [Fe(CN)5(NOS)]4

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