Write the number of ions in the solution of the following complex:

${\mathrm{K}}_4\left[\mathrm{Fe}{\left(\mathrm{CN}\right)}_6\right]$

Write the number of ions in the solution of the following complex:

$\left[\mathrm{Ag}{\left({\mathrm{NH}}_3\right)}_2\right]\mathrm{Cl}$

Write the number of ions in the solution of the following complex:

Find the oxidation state, type of hybridization and geometry of the following complex:

${\left[\mathrm{Ni}{\left(\mathrm{CN}\right)}_4\right]}^{2-}$

Find the oxidation state, type of hybridization and geometry of the following complex: