Give the oxidation numbers of the central metal atoms in the following complex entities.

${\left[\mathrm{Fe}{\left({\mathrm{C}}_2{\mathrm{O}}_4\right)}_3\right]}^{3-}$.

Using $\mathrm{IUPAC}$ norms write the formulas for the following:

Tetrahydroxozincate $\left(\mathrm{II}\right)$.

Using $\mathrm{IUPAC}$ norms write the formulas for the following:

Hexaamminecobalt$\left(\mathrm{III}\right)$ sulphate.

Using $\mathrm{IUPAC}$ norms write the formulas for the following:

Potassium tetrachloridopalladate $\left(\mathrm{II}\right)$.

Using $\mathrm{IUPAC}$ norms write the formulas for the following:

Potassium tris(oxalato)chromate$\left(\mathrm{III}\right)$.

Using $\mathrm{IUPAC}$ norms write the systematic names of the following:

$\left[\mathrm{Co}{\left({\mathrm{NH}}_3\right)}_6\right]{\mathrm{Cl}}_3$.

Using $\mathrm{IUPAC}$ norms write the systematic names of the following:

$\left[\mathrm{Pt}{\left({\mathrm{NH}}_3\right)}_2\mathrm{Cl}\right({\mathrm{NH}}_2{\mathrm{CH}}_3\left)\right]\mathrm{Cl}$.

Using $\mathrm{IUPAC}$ norms write the systematic names of the following:

$[\mathrm{Ti}{\left({\mathrm{H}}_2\mathrm{O}\right)}_6{]}^{3+}$.

Using $\mathrm{IUPAC}$ norms write the systematic names of the following:

${\left[{\mathrm{NiCl}}_4\right]}^{2-}$.