$Fe^{2+}$ shows

What is the value of spin only magnetic moment for $Mn^{2+}$ in $BM$?

$[Co(NH_3)_5Cl]SO_4$ and $[Co(NH_3)_5SO_4]Cl$ are which type of isomers?

Identify the complex ion with spin only magnetic moment of $4.90 \ BM$.

Which of the following complex compounds will exhibit highest paramagnetic behaviour? (At. No. $Ti = 22$,$Cr = 24$,$Co = 27$,$Zn = 30$)

Given below are two statements: one is labelled as Assertion $A$ and the other is labelled as Reason $R$.
Assertion $A$: The total number of geometrical isomers shown by $[Co(en)_2 Cl_2]^{+}$ complex ion is three.
Reason $R$: $[Co(en)_2 Cl_2]^{+}$ complex ion has an octahedral geometry.
In the light of the above statements,choose the most appropriate answer from the options given below: