The formation of Prussian blue color by ferric ions is due to the formation of which compound?

The mismatched combinations are
$A.$ Chlorophyll $- Co$
$B.$ Water hardness $- EDTA$
$C.$ Photography $- [Ag(CN)_2]^-$
$D.$ Wilkinson catalyst $- [(Ph_3P)_3RhCl]$
$E.$ Chelating ligand $- D^{-}$\text{Penicillamine}
Choose the correct answer from the options given below:

Which ligand is used for the treatment of lead poisoning?

The colour of light absorbed by an aqueous solution of $CuSO_4$ is:

For silver plating of copper,$K[Ag(CN)_2]$ is used instead of $AgNO_3$. This is because ........

Match List-$I$ with List-$II$.

List-$I$ (Compound)	List-$II$ (Colour)
$A$. $Fe_4[Fe(CN)_6]_3 \cdot xH_2O$	$I$. Violet
$B$. $[Fe(CN)_5NOS]^{4-}$	$II$. Blood Red
$C$. $[Fe(SCN)]^{2+}$	$III$. Prussian Blue
$D$. $(NH_4)_3PO_4 \cdot 12MoO_3$	$IV$. Yellow

Choose the correct answer from the options given below: