Consider the following test for a group-IV cation. M^2++ H_2 S → A ( Black precipitate )+ byproduct; A + aqua regia → B + NOCl + S + H_2 O; B +…

Consider the following test for a group-IV cation. $$\begin{aligned} & \mathrm{M}^{2+}+\mathrm{H}_2 \mathrm{~S} \rightarrow \mathrm{~A}(\text { Black precipitate })+\text { byproduct } \\ & \mathrm{A}+\text { aqua regia } \rightarrow \mathrm{B}+\mathrm{NOCl}+\mathrm{S}+\mathrm{H}_2 \mathrm{O} \\ & \mathrm{~B}+\mathrm{KNO}_2+\mathrm{CH}_3 \mathrm{COOH} \rightarrow \mathrm{C}+\text { byproduct } \end{aligned} $$The spin-only magnetic moment value of the metal complex C is $\displaystyle \_\_\_\_$ BM (Nearest integer)