First slide

13th group or boron group

Question

Which of the following compounds is formed in borax bead test?

Easy

A

Metaborate
B

Tetraborate
C

Double oxide
D

Orthoborate

Solution

Borax on heating gives $B_{2} O_{3}$ , (transparent glassy bead). When hot $B_{2} O_{3}$ , is brought in contact with colored salt metaborates are formed.
${Na}_{2} B_{4} O_{7} \cdot 10 H_{2} O \overset{Δ}{⟶} B_{2} O_{3} \overset{Coloured}{substance} Metaborate B_{2} O_{3} + CoO \to Co {({BO}_{2})}_{2} blue bead$
cobalt meta borate

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