\((B)\) \(\left[{Fe}({SCN})_{6}\right]^{4-} \rightarrow\) Blood red colour
\((C)\) \({Fe}_{4}\left[{Fe}\left({CN}_{6}\right)\right]_{3} \cdot {H}_{2} {O} \rightarrow\) Prussian blue
\((D)\) \(\left[{Fe}({CN})_{5} {NOS}\right]^{4} \rightarrow\) Violet colour
(આપેલ : $h =6.63 \times 10^{-34} \,Js$ અને $c =3.08 \times 10^{8} \,ms ^{-1}$ )