The number of geometrical isomers for $[Pt(NH_3)_2Cl_2]$ is

The theoretical value of the magnetic moment of the complex formed by the reaction of $Fe^{3+}$ ion with $CN^{-}$ ligand is .......... $B.M.$

Which complex ion has the ability to absorb visible light?

Among the complex ions,$[Co(en)_2Cl_2]^{+}$,$[CrCl_2(C_2O_4)_2]^{3-}$,$[Fe(H_2O)_4(OH)_2]^{+}$,$[Fe(NH_3)_2(CN)_4]^{-}$,$[Co(en)_2(NH_3)Cl]^{2+}$ and $[Co(NH_3)_4(H_2O)Cl]^{2+}$,the number of complex ion$(s)$ that show$(s)$ cis-trans isomerism is

Which of the following will show optical isomers?
$I$. $\text{cis}-[Co(NH_3)_2(en)_2]^{3+}$
$II$. $\text{trans}-[IrCl_2(C_2O_4)_2]^{3-}$
$III$. $[Rh(en)_3]^{3+}$
$IV$. $\text{cis}-[Ir(H_2O)_3Cl_3]$

The complex compound $[Co(SCN)_2(NH_3)_4]Cl$ does not exhibit which of the following types of isomerism?