What is the color of the aqueous solution of $[Co(NH_3)_6]^{3+}$?

Which of the following species exhibits both $LMCT$ and paramagnetism?

Arrange the following complexes in the correct increasing order of their electrical conductivity in aqueous solution:
$(I) [Pt(NH_3)_6]Cl_4$
$(II) [Cr(NH_3)_6]Cl_3$
$(III) [Co(NH_3)_4Cl_2]Cl$
$(IV) K_2[PtCl_6]$

The overall complex dissociation equilibrium constant for the complex $[Cu(NH_3)_4]^{2+}$ ion will be (given $\beta_4$ for this complex is $2.1 \times 10^{13}$,where $\beta_4$ is the association constant).

Which compound is formed when an excess of $KCN$ is added to an aqueous solution of copper sulphate?

Select the correct statement regarding the $[Ni(DMG)_2]$ complex compound.