The isomerism displayed by K₃[Co(NO₂)₆] and K₃[Co(ONO)₆] is: 

The complex that can exhibit linkage isomerism is:

Optical isomerism is exhibited by among the following is/are:

The compound that gives a pair of enantiomorphs is:
(en = NH₂ CH₂CH₂ NH₂)

1. $\left[Co\right(N{H}_3{)}_{4}C{l}_2]N{O}_2$

2. $\left[Cr\right(N{H}_3{)}_6\left]\right[Co\left(CN{)}_6\right]$

3. $\left[Co\right(en{)}_{2}C{l}_2]Cl$

4. $\left[Pt\right(N{H}_3{)}_4\left]\right[PtC{l}_6]$

[Co(NH₃)₄(NO₂)₂]Cl can show:

The number of geometrical isomers shown by $\left[\mathrm{Pt}\left(\mathrm{Py}\right)\left({\mathrm{NH}}_3\right)\mathrm{BrCl}\right]$ are:

Number of possible isomers for the complex [Co(en)₂Cl₂]Cl will be:
(en=ethylenediamine) 

Number of geometrical isomer(s) possible for the complex [Cr(C₂O₄)₃]^3- is/are: