Among the complex ions,
`[Co(NH_2CH_2 CH_2 NH_2 )_2 Cl_2]^(+), [CrCl_2(C_2O_4)_2]^(3-) , [Fe(H_2O)_4(OH)_2]^(+), [Fe(NH_3)_2(CN)_4]^(-), [Co(NH_3)_4(H_2O)Cl]^(2+), [Co(NH_2CH_2 CH_2 NH_2)_2 (NH_3)Cl]^(2+)` the number of complex ion(s) that show(s) cis-trans isomerism is

Answer

6

Explanation

All the six complex ions are octahedral in nature and exhibit cis-trans isomersm.
`[Co(en)_2 Cl_2]^(+) - [M (A A)_2B_2]` type complex, shows geometrical isomerism.