When borax is heated with $CoO$ on a platinum loop, blue coloured bead formed is largely due to
When borax is heated with $CoO$ on a platinum loop, blue coloured bead formed is largely due to
- [JEE MAIN 2022]
- A
$B _{2} O _{3}$
- B
$Co \left( BO _{2}\right)_{2}$
- C
$CoB _{4} O _{7}$
- D
$Co [ B _{4} O _{5}( OH )_{4}]$
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