An octahedral complex of $M^{+3}$ with $NH_3$ and $NO_2^{-}$ ligands has four $M-N$ linkages and two $M-O$ linkages. Which type of isomerism will such a complex exhibit?

Which of the following complex ions is not diamagnetic?

The metal ion whose electronic configuration is not affected by the nature of the ligand and which gives a violet colour in non-luminous flame under hot condition in borax bead test is

Which one of the following complex ions possesses ionisation isomerism?

$X$ is the number of geometrical isomers exhibited by $[Pt(NH_3)(H_2O)BrCl]$.
$Y$ is the number of optically inactive isomer$(s)$ exhibited by $[CrCl_2(ox)_2]^{3-}$.
$Z$ is the number of geometrical isomers exhibited by $[Co(NH_3)_3(NO_2)_3]$.
The value of $X+Y+Z$ is . . . . . . .

Total number of geometrical isomers possible for the complexes $[NiCl_4]^{2-}$,$[CoCl_2(NH_3)_4]^{+}$,$[Co(NH_3)_3(NO_2)_3]$ and $[Co(NH_3)_5Cl]^{2+}$ is