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JEE · NEET Previous Year Question

$Which one of the following complexes is violet in colour?$

Topic: JEE PYQ

Answer: D. Full step-by-step solution below.

A $[Fe(CN)_{6}]^{4 -}$
B $[Fe(SCN)_{6}]^{4 -}$
C $F e_{4} [F e (C N_{6})]_{3} \cdot H_{2} O$
D $(Fe (CN)_{5} NOS)^{4 -}$

Correct answer: D

Solution

(d) (a)[Fe(CN)_{6}]^{4 -} \to Pale yellow solution (b)[Fe(SCN)_{6}]^{4} \to Blood red colour (c) F e_{4} [Fe (C N_{6})]^{3} \cdot H_{2} O \to Prussian blue (d)[Fe(CN)_{5} NOS]^{4 -} \to Violet colour

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