How many water molecules are hydrogen bonded in the following molecular formula $[Cu(H_{2}O)_{4}]^{2+} SO_{4}^{2-} \cdot H_{2}O$?

What is the number of ions produced by $[Pt(NH_3)_4Cl_2]Cl_2$ in an aqueous solution?

$H_2N - CH_2 - CH_2 - NH_2$ acts as a:

Mohr's salt is

What is the number of $=N-OH$ groups present in dimethyl glyoximato?

Identify the total number of complexes having bidentate ligands in them from the following list of complexes:
$a$) Tetracyanonickelate$(II)$ ion
$b$) Trioxalatocobaltate$(III)$ ion
$c$) Sodium hexafluoroaluminate$(III)$
$d$) bis(ethylenediamine)dithiocyanatoplatinum$(IV)$