# (Crystal Field Theory) Consider the complex ion $[Mn(OH_2)_6]^{2+}$ with 5 unpaired electrons. Which response includes all the following statements that are true, and no false statements?

$\begin{array}{1 1}(I)\;\text{It is diamagnetic}\\(II)\;\text{It is a low spin complex}\\(III)\;\text{The metal ion is a }d^5\text{ ion}\\(IV)\;\text{The ligands are weak field ligands}\\(V)\;\text{It is octahedral}\end{array}$

$\begin{array}{1 1}(a)\;I,II\\(b)\;III,IV,V\\(c)\;I,IV\\(d)\;II,V\end{array}$

The metal ion is a $d^5$ ion,the ligands are weak field ligands and it is octahedral.
Hence (b) is the correct answer.