Borax on heating with cobalt oxide forms...

Borax on heating with cobalt oxide forms a blue bead of :

A

`Co(BO_2)_2`

B

`CoBO_2`

C

`Co_3(BO_3)_2`

D

`Na_3Co(BO_3)_2`

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Verified by Experts

The correct Answer is:

A

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