Acidic ferric chloride solution on treatment with excess of potassium ferrocyanide gives a Prussian blue coloured colloidal species. It is :

$K_4[Fe(CN)_6] + M^{x+}(aq.) \to M_4[Fe(CN)_6]_x \downarrow$
Which of the following cations does not respond to the above reaction?

If a didentate ligand ethane-$1, 2$-diamine is progressively added in the molar ratio $en : Ni :: 1: 1, 2: 1, 3: 1$ to $[Ni(H_2O)_6]^{2+}$ aqueous solution,the following coordination entities are formed:
$I$. $[Ni(H_2O)_4en]^{2+}_{(aq)} -$ pale blue
$II$. $[Ni(H_2O)_2(en)_2]^{2+}_{(aq)} -$ blue/purple
$III$. $[Ni(en)_3]^{2+}_{(aq)} -$ violet
The wavelengths in $nm$ of light absorbed in the case of $I$ and $III$ are respectively:

What product is formed by mixing the solution of $K_4[Fe(CN)_6]$ with the solution of $FeCl_3$?

Coordination compounds are of great importance in biological processes. In this context,which of the following statements is $NOT$ correct?

The ligands in the anti-cancer drug $cis$-platin are: