First slide

Borax

Question

Borax is heated in a bunsen burner flame with a compound X on a loop of platinum wire. A blue colored bead of compound Y is formed. Identify X and Y.
X Y
(1) Ca(BO₂)₂ CoO
(2) CoO Co(BO₂)₂
(3) CoO₂ Co(BO₂)₂
(4) CoO CoBO₂

Moderate

A

1
B

2
C

3
D

4

Solution

The borax bead test can be used to identify transition metals as their metaborates have characteristic colours. CoO(X) on a loop of platinum wire, a blue colored Co(BO₂)₂ (Y) bead is formed. Therefore, X and Y are CoO and Co(BO₂)₂ respectively and the correct option is (b).

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