$[Co(NH_3)_5SO_4]Br$ and $[Co(NH_3)_5Br]SO_4$ are a pair of isomers.

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)

Which of the following statements is not true about the complex ion $[Cr(en)_2Cl_2]^+$?

Which of the following compounds shows optical isomerism?

Which of the following pairs of transition metal ions have the same calculated values of magnetic moment?

Which of the following ions are optically active?