The electronic configuration of central metal atom/ion in $$\left[\mathrm{Co}(\mathrm{CN})_6\right]^{3-}$$ is

The spin only magnetic moment of $$[\mathrm{MnBr}_4]^{2-}$$ is $$5.9 \mathrm{~BM}$$. The geometry of this complex ion is

Which of the following compound has same oxidation state of the central metal atom in the cationic and anionic part?

The IUPAC name of the complex $$[\mathrm{Pt}\left(\mathrm{NH}_3\right)_3 \mathrm{Br}\left(\mathrm{NO}_2\right) \mathrm{Cl}] \mathrm{Cl}$$ is