What is the spin-only magnetic moment value $(BM)$ of a divalent metal ion with atomic number $25$ in its aqueous solution?

The pair in which both the species have the same magnetic moment (spin only) is

Explain different types of structural isomerism in coordination compounds.

How many isomeric forms will the complex ion $[Co(NH_3)_4Cl_2]^+$ exhibit?

An aqueous solution of $[Ni(H_2O)_6]^{2+}$ contains $Ni^{2+}$ ions and has a magnetic moment of $2.83 \ BM$. What is the effect on the magnetic moment of the solution when ammonia is added?

Which of the following complex compounds exhibits geometrical isomerism?