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  4. On heating, borax first loses water molecules and swells up. On further heating it turns into a transparent liquid, which solidifies into glass like material known as

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Q. On heating, borax first loses water molecules and swells up. On further heating it turns into a transparent liquid, which solidifies into glass like material known as

The p-Block Elements

Solution:

On heating borax, it first loses water molecules and swells up. On further heating, it turns into a transparent liquid, which solidifies into glass like material known as borax bead.
The corresponding reaction is given below :
$Na _{2} B _{4} O _{7} \cdot 10 H _{2} O \xrightarrow{\Delta} \underset{\text{Sodium metaborate}}{Na _{2} B _{4} O _{7}} \xrightarrow{\Delta} 2 NaBO _{2}+ \underset{\text{Boric anhydride}}{B _{2} O _{3}}$