Borax on heating with cobalt oxide forms...

Borax on heating with cobalt oxide forms a blue bead of

`Co(BO_(2))_(2)`

`Co(BO_(2))`

`Co_(3)(BO_(3))_(2)`

`Na_(3)CO(BO_(3))_(2)`

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The correct Answer is:

`CoO+B_(2)O_(3)toCo(BO_(2))_(2)`(blue bead)

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