The existence of two different coloured complexes with the composition of $[Co(NH_3)_4Cl_2]^+$ is due to

The ratio of $cis$ and $trans$-isomers of the complex $[Ma_2bcde]^{n \pm}$ is

The correct order of the spin only magnetic moment of metal ions in the following low spin complexes,$[V(CN)_6]^{4-}$,$[Fe(CN)_6]^{4-}$,$[Ru(NH_3)_6]^{3+}$,and $[Cr(NH_3)_6]^{2+}$,is

Which of the following compounds is diamagnetic?

An octahedral complex having molecular composition $Co \cdot 5NH_3 \cdot Cl \cdot SO_4$ has two isomers $A$ and $B$. The solution of $A$ gives a white precipitate with $AgNO_3$ solution and the solution of $B$ gives a white precipitate with $BaCl_2$ solution. The type of isomerism exhibited by the complex is,

The type of magnetism exhibited by $[Mn(H_2O)_6]^{2+}$ ion is