S.No. LIST-I
Colour S.No. LIST-2
compound
A) Prussian blue P) ${[Fe (CN)_{5} NOS]}^{4 -}$
B) Violet Q) ${Fe}_{4} {[Fe (CN)_{6}]}_{3}$
C) Blood red R) $[Fe (SCN)]^{2 +}$
D) White ppt S) $AgCl$
A B C D
1 S P R Q
2 R P Q S
3 P Q R S
4 Q P R S

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answer is D.

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Detailed Solution

$\begin{array}{l} {Na}_{4} [Fe (CN)_{5} NOS] \to Violet \\ Fe (SCN)_{3} \to blood red \\ [Fe (SCN)]^{+ 2} \to blood red \\ {Fe}_{4} {[Fe (CN)_{6}]}_{3} \to Prussionblue \\ AgCl \to white PPt \end{array}$

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