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

When $AgNO_3$ is added to a solution of $Co(NH_3)_5Cl_3$,the precipitate of $AgCl$ shows two ionizable chloride ions. This means

Consider the following statements according to Werner's theory:
$(a)$ Ligands are connected to the metal ions by coordinate bonds.
$(b)$ Secondary valencies have directional properties.
$(c)$ Secondary valencies are non-ionisable.
Of these statements:

The coordination number of copper in cuprammonium sulphate is

$EDTA$ has a denticity of:

In dichlorodioxalatochromium$(III)$,the primary and secondary valencies are respectively ......