What is the value of the magnetic moment of $Co^{2+}$ (in $BM$)?

The total number of possible isomers for the coordination compound $[Cu^{II}(NH_3)_4][Pt^{II}Cl_4]$ is.....

An octahedral complex with molecular composition $M \cdot 5NH_3 \cdot Cl \cdot SO_4$ 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 correct match for the complex with its magnetic behavior is:

Which of the following pairs will have the same value of magnetic moment?

The correct statement on the isomerism associated with the following complex ions,
$A$. $[Ni(H_2O)_5NH_3]^{2+}$
$B$. $[Ni(H_2O)_4(NH_3)_2]^{2+}$ and
$C$. $[Ni(H_2O)_3(NH_3)_3]^{2+}$ is