What methods could be used to distinguish between cis and trans isomers of a complex?

Name the individual isomers of each of the following:

(a) $\left[\mathrm{Pt}{\left({\mathrm{NH}}_3\right)}_2{\mathrm{Cl}}_2\right]$
(b) ${\mathrm{CrCl}}_3\mathbf{·}6{\mathrm{H}}_2\mathrm{O}$
(c) $\left[\mathrm{Co}{\left({\mathrm{NH}}_3\right)}_5{\mathrm{NO}}_2\right]{\left({\mathrm{NO}}_3\right)}_2$
(d) $\left[\mathrm{Co}\right({\mathrm{SO}}_4\left)\right({\mathrm{NH}}_3{)}_5]\mathrm{Cl}$

(e)  

(f) $\mathrm{Co}{\left(\mathrm{en}\right)}_2{\mathrm{NH}}_3{\mathrm{BrSO}}_4$
(g) $\left[\mathrm{Pt}\left({\mathrm{NH}}_3\right)\left({\mathrm{H}}_2\mathrm{O}\right)\left({\mathrm{C}}_5{\mathrm{H}}_5\mathrm{N}\right)\left({\mathrm{NO}}_2\right)\right]\mathrm{Cl}$

Account for the following:

(a) $\mathrm{Ni}{\left(\mathrm{CO}\right)}_4$ is tetrahedral
(b) ${\left[\mathrm{Ni}{\left(\mathrm{CN}\right)}_4\right]}^{2-}$ is square planar
(c) ${\left[\mathrm{Ni}{\left({\mathrm{NH}}_3\right)}_6\right]}^{2+}$ is octahedral

Write the formula for the following complex:

nickel hexachloroplatinate$\left(\mathrm{IV}\right)$

Write the formula for the following complex:

tetraamminecopper$\left(\mathrm{II}\right)$ sulphate

Write the formula for the following complex:

potassium tetracyanonickelate$\left(0\right)$