Chemistry - Salt Analysis Question with Solution | TestHub

Consider the following reactions $\mathrm{NiS}+{\mathrm{HNO}}_3+\mathrm{HCl}\to \mathrm{A}+\mathrm{NO}+\mathrm{S}+{\mathrm{H}}_2\mathrm{O}$ $\begin{array}{rl}\mathrm{A}+{\mathrm{NH}}_4\mathrm{OH}+{\mathrm{H}}_3\mathrm{C}-\mathrm{C}& =\mathrm{N}-\mathrm{OH}\\ |& \\ {\mathrm{H}}_3\mathrm{C}-\mathrm{C}& =\mathrm{N}-\mathrm{OH}\end{array}\to \mathrm{B}+{\mathrm{NH}}_4\mathrm{Cl}+{\mathrm{H}}_2\mathrm{O}$ The number of protons that do not involve in hydrogen bonding in the product $B$ is ______.