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

How many isomers are possible for the complex ion $[Cr(NH_3)(OH)_2Cl_3]^{2-}$?

Which of the following is diamagnetic?

Electrons in a paramagnetic compound are

The type of isomerism between $[Co(en)_2(NCS)_2]Cl$ and $[Co(en)_2(NCS)Cl]NCS$ is ............ .

The magnetic moments of the following,arranged in decreasing order,will be:-
$(i)$ $Co^{3+}$ (Octahedral complex with a strong field ligand)
$(ii)$ $Co^{3+}$ (Octahedral complex with a weak field ligand like $F^{-}$)
$(iii)$ $Co^{2+}$ (Tetrahedral complex)
$(iv)$ $Co^{2+}$ (Square planar complex)