Chemistry - Salt Analysis Question with Solution | TestHub

In borax bead test the coloured Metaborates are formed by transition metal salts. $\begin{array}{rl}{\mathrm{Na}}_2{\mathrm{B}}_4{\mathrm{O}}_7\stackrel{\Delta }{⟶}& 2{\mathrm{NaBO}}_2+{\mathrm{B}}_2{\mathrm{O}}_3\\ \text{ Salt of }\mathrm{Co}\stackrel{\Delta }{⟶}& \mathrm{CoO}+\text{ gas }\\ \mathrm{CoO}+{\mathrm{B}}_2{\mathrm{O}}_3\stackrel{\Delta }{⟶}& \mathrm{Co}{\left({\mathrm{BO}}_2\right)}_2\\ & \begin{array}{c}\text{ cobalt metaborate }\\ \text{ (blue colour) }\end{array}\end{array}$