Structural and Stereoisomerism — Prelims Questions

Which of the following pairs represents ionization isomers?

How many geometrical isomers are possible for the complex $[Co(en)_2Cl_2]^+$?

Which of the following complexes is expected to be optically active?

Which type of isomerism is exhibited by the pair: $[Co(NH_3)_6][Cr(CN)_6]$ and $[Cr(NH_3)_6][Co(CN)_6]$?

Which of the following statements about cis- and trans-isomers of square planar complexes of type $MA_2B_2$ is correct?

How many total isomers (including structural and stereoisomers) are possible for the complex $CrCl_3 cdot 6H_2O$?