Which of the following complex compounds does not react with $AgNO_3$ to form a precipitate of $AgCl$?

Number of ambidentate ligands in a representative metal complex $[M(en)(SCN)_4]$ is $[en = \text{ethylenediamine}]$

The oxidation state and covalency of $Al$ in $[AlCl(H_2O)_5]^{2+}$ are respectively

The formula for iron $(III)$ hexacyanoferrate $(II)$ is ..........

Three moles of $AgCl$ get precipitated when one mole of an octahedral coordination compound with empirical formula $CrCl_{3} \cdot 3NH_{3} \cdot 3H_{2}O$ reacts with excess of silver nitrate. The number of chloride ions satisfying the secondary valency of the metal ion is $......$

How many total number of ions are obtained by ionisation of Iron $(III)$ hexacyanoferrate $(II)$ complex?