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Write the chemical reactions associated with the 'borax' best 'test' of cobalt `(II)` oxide.

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When borax in heated , a colourless glassy head is formed of the following composition
`Na_(2)B_(4)O_(7) 10H_(2)O rarr Na_(2)B_(4)O_(7) + 10H_(2)O`
`Na_(2) B_(4)O_(7) overset(Delta ) to+ 2NaBO_(2) + B_(2)O_(3)`
`Co(II) "salt" overset(Delta) to CoO +` some gas
`CoO + B_(2)O_(3) overset(Delta) to Co(BO_(2))_(2)`
A blue - coloured head of coball metaborate is formed
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