Chemistry - Salt Analysis Question with Solution | TestHub

In the borax bead test, $M{n}^{2+}$ ions form manganese borate, which oxidizes to $M{n}^{3+}$ in an oxidizing flame, giving a characteristic amethyst (violet) bead.

$F{e}^{2+}$ gives a yellow/brown colour in a hot oxidizing flame, while green is observed in a reducing flame.

$C{r}^{3+}$ imparts a green colour in both oxidizing and reducing flames, not yellow.

$N{i}^{2+}$ gives a grey/black bead in a reducing flame, while reddish-brown appears in a cold oxidizing flame.