In borax bead test of Cobalt metal or borax is heated in a Bunsen burner flame with

Question

In borax bead test of Cobalt metal $B_{2} O_{3}$ or borax $N a_{2} [B_{4} O_{5} {(O H)}_{4}] \cdot 8 H_{2} O$ is heated in a Bunsen burner flame with Cobalt(II) oxide on loop of platinum wire the mixture fuses to give a glass like metaborate bead.

The colour of bead in flame region 1 and 2 respectively are

Smart Achievers · Accepted Answer

(3)

Cobalt gives blue colour both in oxidizing flame or in reducing flame

Solution

1 Blue and Green only

2 Green and Blue only

3 Blue and Blue only

4 Yellow and Blue only

Ans.
(3)

Cobalt gives blue colour both in oxidizing flame or in reducing flame

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