The spin only magnetic moment value of an octhahedral complex among CoCl₃.4NH₃, NiCl₂.6H₂O and PtCl₄.2HCl, which upon reaction with excess of AgNO₃ gives 2 moles of AgCl is____________B. M. (Nearest integer)

For precipitation of two moles of AgCl

Two Cl will produce as a free anion

CoCl₃.4NH₃ complex will $\left[CO{\left(N{H}_3\right)}_{4}C{l}_2\right]$ Cl (will not give 2Cl)

$PtC{l}_4.2HCl\to$ complex will be H2 [PtCl6] will not any Cl

$NiC{l}_2.6H_{2}O\to \left[Ni{\left(H_{2}O\right)}_6\right]C{l}_2$ will produce two Cl ion.

${\left[Ni{\left(H_{2}O\right)}_6\right]}^{++}+2C{l}^{-}\underset{AgN{O}_3}{\overset{}{\to }}2AgCl\left(s\right)$ precipitate formation

$N{i}^{2+}\to \left[Ar\right]3d^{8}4s^0$

$\mu =\sqrt[]{2\left(2+2\right)}=\sqrt[]{8}=2.84BM=3$