When borax is heated with CoO on a platinum loop, blue colou... | Chemistry | SolveeIt

When borax is heated with CoO on a platinum loop, blue coloured bead formed is largely due to

$B_2O_3$

$CO(BO_2)_2$

$COB_4O_7$

$CO[B_4O_5(OH)_4]$

Answer

$CO(BO_2)_2$

Explanation

$Na_2B_4O_7→ 2NaBO_2+B_2O_3$
$B_2O_3+CoO→Co(BO_2)_2$
Cobalt metaborate (Blue Coloured)

So, the correct option is (B): $Co(BO_2)_2$ .

Chemistry Question on p -Block Elements