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  4. What happens when a mixture of cobalt oxide and borax is heated in a flame on a loop of platinum wire?

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Q. What happens when a mixture of cobalt oxide and borax is heated in a flame on a loop of platinum wire?

The p-Block Elements

Solution:

$Na_{2}B_{4}O_{7}\cdot 10H_{2}O \xrightarrow{\Delta} Na_{2}B_{4}O_{7}\xrightarrow{\Delta} 2NaBO_{2}+B_{2}O_{3}$
$B_{2}O_{3}+Co O \rightarrow \underset{\text{Cobalt metaborate (blue bead)}}{Co(BO_{2})_{2}}$