Assign $A$,$B$,$C$,$D$ from the given type of reaction.
$K_3[Fe(CN)_6] + FeCl_3 \longrightarrow Fe[Fe(CN)_6] \downarrow$

In a complexometric titration of a metal ion with a ligand,the reaction is $M$ $(Metal-ion)$ + $L$ $(Ligand)$ $\to$ $C$ $(Complex)$. The end point is estimated spectrophotometrically (through light absorption). If '$M$' and '$C$' do not absorb light and only '$L$' absorbs,then the titration plot between absorbed light $(A)$ versus the volume of ligand '$L$' $(V)$ would look like:

Ferric ion forms a Prussian blue coloured precipitate due to the formation of:

Which of the following compounds is used as an anti-cancer agent?

Which product is formed when a solution of $K_4[Fe(CN)_6]$ is added to a solution of $FeCl_3$?

Which ligand is useful for the removal of the toxic effect of lead metal in the body during chelate therapy treatment?