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

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

JEE MainJEE Main 2022The p-Block Elements

Solution:

$Na _2 B _4 O _7 \cdot 10 H _2 O \stackrel{\Delta}{\longrightarrow} Na _2 B _4 O _7+10 H _2 O$
$ Na _2 B _4 O _7 \stackrel{\Delta}{\longrightarrow} 2 NaBO _2 \text { (sodium meta borate) }+ B _2 O _3 $
$B _2 O _3+ CoO \rightarrow Co \left( BO _2\right)_2 \text { (cobalt(II)meta borate) }$ Blue Bead