Find the number of correct statements?

(a) Pd(Il) and Pt(II) form mostly the 4-ooordination, square planar. diamagnetic oo-ordinatien entities, (b) The free ions ${\mathrm{Pd}}^{+2},{\mathrm{Pt}}^{+2}$ and ${\mathrm{Ni}}^{+2}$are paramagnetic in ground states. 

(c) Octahedral${\left[\mathrm{Co}{\left({\mathrm{H}}_2\mathrm{O}\right)}_6\right]}^{+2}$ is pink, that, of tetrahedral ${\left[{\mathrm{CoCl}}_4\right]}^{2-}$is blue

(d) ${\mathrm{\Delta }}_0=\frac{4}{9}{\mathrm{\Delta }}_t$

(e) If a multidentate ligand happens to be cyclic and there are no unfavourable steric effects a further increase in stability occurs. This is termed as macrocyclic effect.